APA (7e ed.) Bronvermelding

Welburn, T., & Price, W. (1990). Structured Cobol 47: Fundamentals and style (3rd ed.). Mitchell McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Welburn, Tyler, en Wilson Price. Structured Cobol 47: Fundamentals and Style. 3rd ed. New York: Mitchell McGraw-Hill, 1990.

MLA (9e ed.) Bronvermelding

Welburn, Tyler, en Wilson Price. Structured Cobol 47: Fundamentals and Style. 3rd ed. Mitchell McGraw-Hill, 1990.