Cita APA (7a ed.)
Boettcher, R. R. (1987). Structured programming in COBOL. Holt, Rinehart and Winston.
Cita Chicago Style (17a ed.)
Boettcher, Robert R. Structured Programming in COBOL. New York: Holt, Rinehart and Winston, 1987.
Cita MLA (9a ed.)
Boettcher, Robert R. Structured Programming in COBOL. Holt, Rinehart and Winston, 1987.
Precaución: Estas citas no son 100% exactas.