CLOS Programming (The Universe Known as LISP)

Sonya Keene, Object-Oriented Programming in Common Lisp–A Programmer’s Guide to CLOS, 1989
- 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
"[This] is a very easy introduction and more thorough than the single chapter in [Graham 1995], but it will obviously take you longer to read." –Levine.