Macintosh OS X: Aqua Human Interface Guidelines
http://developer.apple.com/techpubs/macosx/Essentials/AquaHIGuidelines/index.html

Apple Inc.
2003

Abstract:

This document, which covers features up to Mac OS X version 10.2, describes what you need to do to design your application for Aqua. Primarily intended for Carbon and Cocoa developers who want their applications to look right and behave correctly in Mac OS X, these guidelines provide examples of how to use Aqua interface elements. Java application developers will also find these guidelines useful.