Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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