Cita APA (7a ed.)

Nickerson, R. C. (1977). Cobol programming: A structured approach. Winthrop.

Cita Chicago Style (17a ed.)

Nickerson, Robert C. Cobol Programming: A Structured Approach. Cambridge (Massachusetts): Winthrop, 1977.

Cita MLA (9a ed.)

Nickerson, Robert C. Cobol Programming: A Structured Approach. Winthrop, 1977.