Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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