Cita APA (7th ed.)

Stern, N. B., & Stern, R. A. (1991). Structured COBOL programming. John Wiley & Sons.

Cita Chicago (17th ed.)

Stern, Nancy B., i Robert A. Stern. Structured COBOL Programming. New York: John Wiley & Sons, 1991.

Cita MLA (9th ed.)

Stern, Nancy B., i Robert A. Stern. Structured COBOL Programming. John Wiley & Sons, 1991.