A design for APL software for man-machine dialogue with statistical applications. - Michael L. Friendly; Richard M. Levine (APL, 1975)

An input-checking function for APL systems. - Richard M. Levine (APL, 1984)

AES: SunAmerica's Appointment Expert System. - Richard M. Levine; Gary MacKinnon; Frank Angrisani; Lew Roth (IAAI, 1991)

Recent Work on the Toronto Toolkit. - Richard M. Levine (APL, 1993)