Project MAC Progress Report IV: July 1966 to July 1967, n.d., p. 19, archivado desde el original el 8 de marzo de 2016, consultado el 31 de enero de 2018, «The higher-level language used for most of the vision laboratory program is the PDP-6 LISP System. This system is based chiefly on the LISP 1.5 programming language, but has been extensively modified in a number of ways. These include many new functions and services, including facilities for linking with programs written in other languages.».
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Project MAC Progress Report IV: July 1966 to July 1967, n.d., p. 19, archivado desde el original el 8 de marzo de 2016, consultado el 31 de enero de 2018, «The higher-level language used for most of the vision laboratory program is the PDP-6 LISP System. This system is based chiefly on the LISP 1.5 programming language, but has been extensively modified in a number of ways. These include many new functions and services, including facilities for linking with programs written in other languages.».
