The Art of the Metaobject Protocol
Book on the Metaobject Protocol (MOP) commonly used in Common Lisp Object System (CLOS) implementations.
(en.wikipedia.org) The Art of the Metaobject Protocol - Wikipedia website
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The Art of the Metaobject Protocol (AMOP) is a 1991 book by Gregor Kiczales, Jim des Rivieres, and Daniel G. Bobrow (all three working for Xerox PARC) on the subject of metaobject protocol.