एपीए उद्धरण

Worth, T. (1981). COBOL for beginners. Prentice-Hall of India.

शिकागो स्टाइल उद्धरण

Worth, Thomas. COBOL for Beginners. New Delhi: Prentice-Hall of India, 1981.

एमएलए उद्धरण

Worth, Thomas. COBOL for Beginners. Prentice-Hall of India, 1981.