I have not read this but skimmed through it quickly and seems like a good one to help understand the basics.
It is for common Lisp but I am sure it applies to AutoLisp.
As a example he starts with some good explanations and gives visual examples to go with explanations.
I can not remember where i got it so I uploaded the pdf.
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The title is
COMMON LISP: A Gentle Introduction to Symbolic Computation
