Cita APA (7th ed.)

Stern, N. B., & Stern, R. A. (1991). Structured COBOL programming (6th ed.). Wiley.

Cita Chicago (17th ed.)

Stern, Nancy B., i Robert A. Stern. Structured COBOL Programming. 6th ed. New York: Wiley, 1991.

Cita MLA (8th ed.)

Stern, Nancy B., i Robert A. Stern. Structured COBOL Programming. 6th ed. Wiley, 1991.