R. M. Shapiro "Computers, connector systems, and data descriptions" pp72-73

(1962) Artificial languages  

Languages mentioned BNF {1959} Backus Naur Form FLPL {1958} FORTRAN List Processing Language IPL {1954} The first list-processing language KLS {1962} Knotted List Structures LISP {1958} A list processing system with emphasis on recursion and formalism THREADED LISTS {1959} List-processing language XTRAN {1958} Interactive extensible dialect of FORTRAN