Layzell, P.Z. "The History of Macro-Processors in Programming Language Extensibility"

(1985) The Computer Journal 28(1) January 1985  

Languages mentioned CLEF {1985} GPM {1965} General Purpose Macro-generator LIMP {1967} Macro processor MCOBOL {1980} Macro extensions to COBOL ML/I {1967} TRAC {1959} A man-machine string manipulating language WISP {1964} Macro-based list processing language XPOP {1964} Extensible macro assembly