Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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