APA (7th ed.) Citation

Gottfried, B. S. (1973). PL/I programmer's reference guide. Quantum.

Chicago Style (17th ed.) Citation

Gottfried, Byron S. PL/I Programmer's Reference Guide. New York: Quantum, 1973.

MLA (8th ed.) Citation

Gottfried, Byron S. PL/I Programmer's Reference Guide. Quantum, 1973.