Franklin

Modular programming in COBOL [by] Russell M. Armstrong.

MLA

Armstrong, Russell M. Modular Programming In Cobol. New York: Wiley, 1973.

APA

Armstrong, R. M. (1973). Modular programming in COBOL. New York: Wiley.

Chicago

Armstrong, Russell M. Modular Programming In COBOL. New York: Wiley, 1973.