Cita APA (7th ed.)

Stern, N. B., & Stern, R. A. (1970). COBOL programming. Wiley.

Cita Chicago (17th ed.)

Stern, Nancy B., i Robert A. Stern. COBOL Programming. New York: Wiley, 1970.

Cita MLA (8th ed.)

Stern, Nancy B., i Robert A. Stern. COBOL Programming. Wiley, 1970.