Postley, J. A. "Mark IV: Evolution of the Software Product, a Memoir" pp43-50

(1998) IEEE Annals of the History of Computing, 20(1) 1998  

Languages mentioned GIRLS {1961} Generalized Information Retrieval and Listing System GIS {1966} General Information Store MARK II {1964} MARK III {1966} MARK IV {1968}