If you already know C, get THINK C. If you already know Pascal, get THINK Pascal. If you don't know either, the Mac is quite a difficult environment to learn on. I'd recommend THINK Pascal in that case and writing simple apps that use it's console window and drawing window rather than Mac applications.

Also, don't worry about Inside Macintosh - use THINK Reference instead. Basically, learn to walk before you try to run. Inside Macintosh is much more complicated.

I'd suggest finding a second hand copy of the books by Dave Mark and Cartwright Reed.

Ken