Cita APA (7th ed.)

Stern, N., & Stern, R. A. (1988). Structured COBOL programming (5th ed.). National Bookstore.

Cita Chicago (17th ed.)

Stern, Nancy, i Robert A. Stern. Structured COBOL Programming. 5th ed. Manila: National Bookstore, 1988.

Cita MLA (9th ed.)

Stern, Nancy, i Robert A. Stern. Structured COBOL Programming. 5th ed. National Bookstore, 1988.