I think both On Lisp and ANSI Common Lisp from PG are good books. The only criticism I have is that PG does not write code in "Common Lisp style". It's often

I think both On Lisp and ANSI Common Lisp from PG are good books. The only criticism I have is that PG does not write code in "Common Lisp style". It's often more of Scheme with Common Lisp.