Cita APA (7th ed.)

Fenton, J. P., & Williams, B. K. (1988). Structured COBOL: Programming and problem solving. Times Mirror/Mosby College Pub.

Cita Chicago (17th ed.)

Fenton, J. Patrick, i Brian K. Williams. Structured COBOL: Programming and Problem Solving. St. Louis: Times Mirror/Mosby College Pub, 1988.

Cita MLA (9th ed.)

Fenton, J. Patrick, i Brian K. Williams. Structured COBOL: Programming and Problem Solving. Times Mirror/Mosby College Pub, 1988.