Possibly of interest:
https://web.archive.org/web/20140627074459/http://www.chesscafe.com/text/hansen85.pdf
http://www.gambitbooks.com/pdfs/Win_with_the_London_System.pdf
https://www.newinchess.com/Shop/Images/Pdfs/9035.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7619.pdf
https://web.archive.org/web/20140627100246/http://www.chesscafe.com/text/hansen139.pdf
https://web.archive.org/web/20140708093403/http://www.chesscafe.com/text/tips.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7656.pdf
https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student
and there is also the Cyrus Lakdawala book, First Steps: The Colle and London System.
https://www.chess.com/article/view/how-to-understand-openings
London system

I play the London System. The following are currently the best books on it (in order)....
1. "Win With The London System" by Sverre Johnsen & Vlatko Kovacevic
2. "The Agile London System" by Alfonso Romero Holmes & Oscar de Prado Rodriguez
3. "Winning With the Modern London System" by Nikola Sedlak
I would highly recommend the first two, as they have the most comprehensive treatment. The third one is not as comprehensive and is optional.
edit 10 January 2021:
Regarding Sedlak's first book on the London System. He has published a second volume "Winning With The Modern London System - Part 2" which covers 1...Nf6. I therefore consider that taken together, Sedlak's two books on the London System provide good coverage.

thank you very much for your support. I know this topic belongs to chess openings but accidentaly I have written this forum on genral chess discussion pls also tell how can I get these books pdf
If the goal is to get free access to a book, I fear that that is not going to be possible, although there is a free introduction available at
https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student
and probably there are bunches of free videos available here and there. On the other hand, if one is seeking electronic versions of books, one can buy electronic versions for Play the London System and First Steps: The Colle and London Systems from Everyman Chess, and an electronic version of Win with the London System from Gambit Publications. If cost is an issue, I strongly suggest using the samples and reviews in post #2 to try to get an idea about what book is likely to be helpful to you at this point.
"... Just because a book contains lots of information that you don’t know, it doesn’t necessarily mean that it will be extremely helpful in making you better at this point in your chess development. ..." - Dan Heisman (2001)
https://web.archive.org/web/20140626180930/http://www.chesscafe.com/text/heisman06.pdf
Another point to consider is that some of these books are a lot older than others. In view of the surprising number of recent London books, it seems as though there may be some value in getting a recent book with some indication of whatever new ideas have come to light.

The London System is the most boring chess opening ever invented. It's even more boring than playing cribbage.

The Agile London System... but I would look at the Ginger GM youtube channel, he has 3 videos showing you how to get started, probably all you need atm

Run, run before that crappy system infects you!
Another weak player, with zero theory knowledge who has an opinion about an aggressive system he doesn't know how to play....that's why you remain a 1500-1600 :))
John Cox (FIDE rating 2300) in his his book "Dealing with the d4 deviations" says the following about the London system:
"it would be silly not to be honest-this is not the sharpest opening chess has to offer". Clearly, John Cox does not see this as aggressive opening. Perhaps your incorrect evaluation of the opening is why you will remain at 2000

However, Simon Williams recommends a range of aggressive options in the London System, it is all about interpretation, making the opening work in your style

Run, run before that crappy system infects you!
Another weak player, with zero theory knowledge who has an opinion about an aggressive system he doesn't know how to play....that's why you remain a 1500-1600 :))
Oh boy, the London system is crap, your little chapter about the Reversed Reti will not save you.
... John Cox (FIDE rating 2300) in his his book "Dealing with the d4 deviations" says the following about the London system: "it would be silly not to be honest-this is not the sharpest opening chess has to offer". ...
In the 2005 book, he also wrote: "... Dealing with these openings successfully is a matter of psychological approach among other things ... In the 1930s the top guys didn't know whether these openings or the Queen's Gambit were better. These were the 2700s of their day, they understood chess a lot better than I do, and if something wasn't obvious to them, it was arrogant of me to think it would be obvious to me if I just figured it out over the board. I could list easily a hundred 2550+ players who have succumbed to the openings in these books. These openings produce as red-blooded a struggle as any, and if you're not ready for it, you're starting at a big disadvantage. ... If someone has played the London System ever since 1952 (you know the type) then they have an advantage over you that isn't going to go away. ..." The London System chapter is twenty pages.

Are you a troll? White just gets a crappy position against the old setups that involve a Kings Indian piece formation, the fact that a 2700 plays that does not change it.
If the London is so great why wasnt it played in the 2016 WC?

Are you really gonna make me read that crappy Lakdawala book all of you London fish praise just to refute his whole analysis? I will have to charge you 50 bucks for that.

Run, run before that crappy system infects you!
Another weak player, with zero theory knowledge who has an opinion about an aggressive system he doesn't know how to play....that's why you remain a 1500-1600 :))
John Cox (FIDE rating 2300) in his his book "Dealing with the d4 deviations" says the following about the London system:
"it would be silly not to be honest-this is not the sharpest opening chess has to offer". Clearly, John Cox does not see this as aggressive opening. Perhaps your incorrect evaluation of the opening is why you will remain at 2000
1. I defeated Bogdan Posedaru with it, Fide 2300, because he didn't know the opening symmetric variation, where black gets into a miserable ending 2. My coach, Catalin Carmaciu, Fide 2420, tought me the attacking ideas ( Ne5, f4, g4, etc) OR after Ne5 if black takes, you take with the pawn, you mess up your pawn structure to attack 3. Players like Boris Savchenko, 2720, play it frequently ( see his games on YouTube) + Carlsen defeated Giri and Tomashevsky, Aronian defeated Nepomniatchi (2700+) with London... p.s.: do you even know the line with ( after castle) h4 Bxh4, g3! Be7, Kg2 and now: Rh1 + prepare rook sacrifice on h7!!! Of course you don't know....
No I do not know or care. The reason I do not know or care is that most people I meet who play the London do not know these attacking lines either. This is because they are choosing the London system to avoid learning about opening theory. The fact that they do not the attacking lines is why most of the games I play against the London system are normally boring.
hi guise As I am a beginner that is why I want to know how to play London system and want you guise to post your games in which u have played London system or just recommend me a good book on London system recommending a site will also help so pls pls pls help me guise