Παραπομπή APA

Worth, T. (1979). COBOL for beginners. Prentice Hall of India.

Παραπομπή Chicago Style

Worth, Thomas. COBOL for Beginners. New Delhi: Prentice Hall of India, 1979.

Παραπομπή MLA

Worth, Thomas. COBOL for Beginners. Prentice Hall of India, 1979.