Do you really think wikipedia and stockfish will give you an idea of an opening. If you read a (good) opening book that's written in a year (let's say 2010) you can be sure every important line up to 2009/10 is covered and ideas and development are described/shown!
Wikipedea and stockfish hardly can cover the same thing! A book or DVD is IMHO always the better choice.
Wikipedia has some information about openings, but it's not very thorough. In it you may find the name of an opening, some variations and basic ideas, but it can't (and isn't meant to) be compared with a book dedicated to a certain opening. Where you'll be able to find the information you're looking for depends on how detailed information you need - if you need less detailed information but you want to look at more openings or variations, probably wikipedia will be best for you; if you need information on a specific variation, its strategy, game examples, etc. - you'd better look for a book.
Your choice.
I hope all my OTB opponents will turn to Wikipedia and discard chess books... 
Actually I've looked at a fair number of wikipedia chess articles and overall I think they're pretty good BUT far from adequate to rely on along with any chess engine to "learn chess" from. For starters you can use a search engine to find lots of useful chess article on any phase of the game as well as looking at a few of the many articles written here for beginners. You can also find digital copies of old chess books (no longer copyrighted) online you can download to read.
You should consider purchasing either "Ideas Behind the Chess Openings" by GM Fine or "Fundamental Chess Openings" (FCO) by GM van der Sterren, both available at amazon (and elsewhere) Fine's book should be fine for you (pun intended) for right now despite the fact it was written way back in 1942 and I'm sure you can find a used copy for less $ than FCO, but either book will teach you a lot more than you'll ever glean from wikipedia and stockfish.
I'm thinking I don't really need a book on chess openings... if i just use wikipedia and stuff like 365chess.com for openings/stockfish