If you're looking into a serious reference check out iPhone App Development: The Missing Manual (http://www.amazon.com/iPhone-App-Development-Missing-Manual/...). It covers so much and then some, it's truly the holy bible of iOS development work.

Otherwise try checking Google: http://www.google.com/search?q=develop+iphone+apps

Craig Hockenberry's Missing Manual book on iPhone development is excellent, and I recommend it to everyone who's interested in learning iOS development. http://oreilly.com/catalog/9780596809775