[ACM] CACM 15(06) (June 1972)
(1972)
(1957)
Communications of the ACM
Gimpel, J. F. (1972)
Gimpel, J. F. "Blocks - A new datatype for SNOBOL4"
Sammet, Jean E., (1972)
Sammet, Jean E., "Programming languages: history and future"