APLGOL, an Experimental Structured Programming Language. - Robert A. Kelley (IBM J. Res. Dev., 1973)

APLGOL-2 a structured programming language system for APL. - Robert A. Kelley; John R. Walters (APL, 1974)

Evaluation of design methodologies. - Makoto Arisawa; Glenn David Bergland; Earle C. Bowers; John N. Buxton; Robert A. Kelley; Norman L. Kerth; Sabina H. Saib; Peter D. Ting; Douglas A. Troy; Stuart H. Zweben (ACM SIGSOFT Softw. Eng. Notes, 1982)