Essential LISP by John Anderson et al., published in 1987, was an introductory Lisp book based on research on how beginners learn Lisp.
https://openlibrary.org/books/OL21180323M/Essential_LISP
For code examples it used a subset of features available in most dialects of the time. Where the book differs it goes with Common Lisp with adaptation notes for other dialects, including Interlisp.
