APA (7th ed.) Citation

Brown, P. R., & Gwillim, V. (1985). User guide to COBOL 85. Halsted Press.

Chicago Style (17th ed.) Citation

Brown, P. R., and V. Gwillim. User Guide to COBOL 85. New York: Halsted Press, 1985.

MLA (9th ed.) Citation

Brown, P. R., and V. Gwillim. User Guide to COBOL 85. Halsted Press, 1985.