Grauer, R. (1985). Structured cobol programming. Prentice Hall.
Cita Chicago (17th ed.)Grauer, Robert. Structured Cobol Programming. Englewood Cliffs: Prentice Hall, 1985.
Cita MLA (9th ed.)Grauer, Robert. Structured Cobol Programming. Prentice Hall, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.