Shelly, G. B. (2000). Structured cobol programming (2nd ed.). Course Technology.
Cita Chicago (17th ed.)Shelly, Gary B. Structured Cobol Programming. 2nd ed. Cambridge, Massachusetts: Course Technology, 2000.
Cita MLA (9th ed.)Shelly, Gary B. Structured Cobol Programming. 2nd ed. Course Technology, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.