Cita APA (7th ed.)

Boettcher, R. R. (1987). Structured programming in COBOL. Holt, Rinehart and Winston.

Cita Chicago (17th ed.)

Boettcher, Robert R. Structured Programming in COBOL. New York: Holt, Rinehart and Winston, 1987.

Cita MLA (8th ed.)

Boettcher, Robert R. Structured Programming in COBOL. Holt, Rinehart and Winston, 1987.