Buhler, S. and Buhler, R "Differences between P-STAT and SPSS, as perceived by the authors of P-STAT" pp260-264

Computer Science and Statistics: Tenth Annual Symp (1978) Computer Science and Statistics: Tenth Annual Symposium on the Interface, pp. 265-70. Edited by D. Hogben and D. W. Fife. (National Bureau of Standards Special Publication 503.) Washington, DC: National Bureau of Standards; 1978  

Languages mentioned P-STAT {1971} Princeton stats package SPSS {1965} Stats system