Cita APA (7th ed.)
McGarth, R. R., & Stair, R. M. (1981). Essentials of cobol programming. Richard D Irwin.
Cita Chicago (17th ed.)
McGarth, Roger R., i Ralph M. Stair. Essentials of Cobol Programming. Homewood, Ill.: Richard D Irwin, 1981.
Cita MLA (9th ed.)
McGarth, Roger R., i Ralph M. Stair. Essentials of Cobol Programming. Richard D Irwin, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.