APA (7e ed.) Bronvermelding

Welburn, T. (1983). Advanced structured COBOL: Batch, on-line, and data-base concepts.

Chicago (17e ed.) Bronvermelding

Welburn, Tyler. Advanced Structured COBOL: Batch, On-line, and Data-base Concepts. 1983.

MLA (9e ed.) Bronvermelding

Welburn, Tyler. Advanced Structured COBOL: Batch, On-line, and Data-base Concepts. 1983.

Let op: Deze citaties zijn niet altijd 100% accuraat.