Flavors, from 1979 or so. https://www.softwarepreservation.org/projects/LISP/MIT/nnnfla1-20040122.pdf https://www.softwarepreservation.org/projects/LISP/MIT/nn

Flavors, from 1979 or so. https://www.softwarepreservation.org/projects/LISP/MIT/nnnfla1-20040122.pdf https://www.softwarepreservation.org/projects/LISP/MIT/nnnfl... LOOPS, from about the same time. https://interlisp.org/documentation/2024-loops-book-1.pdf https://interlisp.org/documentation/2024-loops-book-1.pdf More general discussion in a OOPSLA contribution from 1986. https://web.archive.org/web/20220817140051/https://interlisp.org/docs/1986-commonloops.pdf https://web.archive.org/web/20220817140051/https://interlisp... The 1988 book about CLOS, the approach that was later accepted in ANSI Common Lisp. https://doc.lagout.org/programmation/Lisp/Object-Oriented%20Programming%20in%20Common%20Lisp_%20A%20Programmer%27s%20Guide%20to%20CLOS%20%5BKeene%201989-01-11%5D.pdf https://doc.lagout.org/programmation/Lisp/Object-Oriented%20...