APA (7th ed.) Citation

Cowan, D. D., Dirksen, D. J., & Graham, A. S. An introduction to COBOL with WATBOL: A structured programmming approach.

Chicago Style (17th ed.) Citation

Cowan, D. D., D. J. Dirksen, and Alexander Steel Graham. An Introduction to COBOL with WATBOL: A Structured Programmming Approach.

MLA (9th ed.) Citation

Cowan, D. D., et al. An Introduction to COBOL with WATBOL: A Structured Programmming Approach.