I’ve tried to make this book thorough, but it isn’t comprehensive. Xcode is too large and subtle a system to cover completely here, and Apple constantly updates it. Further, your needs as a Mac programmer go beyond simply using the tools. This appendix is a brief reference to resources you can use to go further and keep current.
Step into Xcode: Mac OS X Development (by Fritz Anderson; Addison-Wesley, 2006). This is the first edition of the book you are now reading. It is still useful if you are using some version of Xcode 2.
Beginning Xcode (Programmer to Programmer) (by James Bucanek; Wrox, 2006). A fine book that covers Xcode 2.
Cocoa Design Patterns (by Eric M. Buck; Addison-Wesley, 2008). Erik has many years’ ...