ROY M.K. (1991). COBOL PROGRAMMING. TATA MC GRAW HILL.
Cita Chicago (17th ed.)ROY M.K. COBOL PROGRAMMING. TATA MC GRAW HILL, 1991.
Cita MLA (9th ed.)ROY M.K. COBOL PROGRAMMING. TATA MC GRAW HILL, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.