Welburn, T., & Price, W. (1990). Structured Cobol 47: Fundamentals and style (3rd ed.). Mitchell McGraw-Hill.
Chicago (17e ed.) BronvermeldingWelburn, Tyler, en Wilson Price. Structured Cobol 47: Fundamentals and Style. 3rd ed. New York: Mitchell McGraw-Hill, 1990.
MLA (9e ed.) BronvermeldingWelburn, Tyler, en Wilson Price. Structured Cobol 47: Fundamentals and Style. 3rd ed. Mitchell McGraw-Hill, 1990.
Let op: Deze citaties zijn niet altijd 100% accuraat.