ROY , M. &. D. (1985). COBOL PROGRAMMING. TATA MC GRAW HILL.
Lua i Stíl Chicago (17ú heag.)ROY , M.K. & DASTIDAR. COBOL PROGRAMMING. TATA MC GRAW HILL, 1985.
Lua MLA (9ú heag.)ROY , M.K. & DASTIDAR. COBOL PROGRAMMING. TATA MC GRAW HILL, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.