APA (7th ed.) Citation

Parkin, A. (1981). COBOL workbook: A self-study introduction to the COBOL programming language. Edward Arnold.

Chicago Style (17th ed.) Citation

Parkin, Andrew. COBOL Workbook: A Self-study Introduction to the COBOL Programming Language. London: Edward Arnold, 1981.

MLA (9th ed.) Citation

Parkin, Andrew. COBOL Workbook: A Self-study Introduction to the COBOL Programming Language. Edward Arnold, 1981.

Warning: These citations may not always be 100% accurate.