https://www.softwarepreservation.org/projects/LISP/MIT/nnnfl...
LOOPS, from about the same time.
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...
The 1988 book about CLOS, the approach that was later accepted in ANSI Common Lisp.
https://doc.lagout.org/programmation/Lisp/Object-Oriented%20...