The standard reference is:
Common Lisp, The Language, Second Edition, by Guy L Steele, Jr. Digital Press 1990, ISBN 1-55558-041-6.
This book is choppy because it was re-edited to reflect on-going standardization, and a bit dated because the ANSI Common Lisp standard has since been adopted, but as far as I know it is still the standard reference in practice.
Guy L Steele Jr. is himself an interesting and influential member of the computing community, who did his thesis on constraint-oriented programming languages, has made major contributions to standardization efforts for Common Lisp, Scheme (a smaller, faster lisp), Fortran (still the unchallenged ruler of numeric computing) and C, as well as having been chief scientist of Thinking Machines corporation and hence a major contributor to the development of massively parallel computers.
His varied interests include Loglan/Lojban, an artificial human language based on symbolic logic. His is always a thoughtful and interesting voice of reason.
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