Henneman,W. "An Auxiliary Language for More Natural Expression - The A-language", pp239-248

Berkeley, E.C., and Bobrow. D.G. (ed). (1966) Berkeley, E.C., and Bobrow. D.G. (ed). "The Programming Language LISP, its Operation and Applications". MIT Press, 1966.  

Languages mentioned A-language {1964} An early Algol-like surface syntax for Lisp