Cita APA (7th ed.)

Litecky, C. R., & Davis, G. B. (1987). Structured COBOL: A step by step approach. McGraw-Hill.

Cita Chicago (17th ed.)

Litecky, Charles R., i Gordon Bitter Davis. Structured COBOL: A Step by Step Approach. New York: McGraw-Hill, 1987.

Cita MLA (9th ed.)

Litecky, Charles R., i Gordon Bitter Davis. Structured COBOL: A Step by Step Approach. McGraw-Hill, 1987.