Warren, David H.D., Luis M. Pereira, and Fernando C.N. Pereira, "Prolog: The Language and its Implementation Compared with LISP"

[AIPL 1977] (1977) SIGPLAN Notices 12(08) August 1977 "Symposium on Artificial Intelligence and Programming Languages"  

Languages mentioned LISP {1958} A list processing system with emphasis on recursion and formalism Prolog {1971} Logic programming language