Cocoa

More about Cocoa on Wikipedia

Mac OS X Advanced Development Techniques
by Joe Zobkiw
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Cocoa(R) Programming for Mac(R) OS X
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Learning Cocoa with Objective-C, 2nd Edition
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Cocoa Programming
by Scott Anguish
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Programming Mac OS X A Guide for Unix Developers
by Kevin O'Malley
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Mac OS X Programming
by Dan Sydow
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