Cita APA (7th ed.)

Roy, M. (1982). Cobol programming (2nd.). Tata Mc Graw Hill.

Cita Chicago (17th ed.)

Roy, M. Cobol Programming. 2nd. New Delhi: Tata Mc Graw Hill, 1982.

Cita MLA (9th ed.)

Roy, M. Cobol Programming. 2nd. Tata Mc Graw Hill, 1982.