Simon, H. A.; Newell, A. "Information Processing Language V on the IBM 650"

[AHOC] (1986) Annals of the History of Computing, 08(1) January 1986 (IBM 650 Issue)  

Languages mentioned IPL {1954} The first list-processing language IPL-II {1955} Information Processing Language version 2 IPL-III {1955} Information Processing Language version 3 IPL-IV {1956} Information Processing Language version 4 IPL-V {1957} Information Processing Language v5