Παραπομπή APA

National productivity council & Altekar, V. (1975). Productivity. National productivity council.

Παραπομπή Chicago Style

National productivity council και V.A Altekar. Productivity. New Delhi: National productivity council, 1975.

Παραπομπή MLA

National productivity council και V.A Altekar. Productivity. National productivity council, 1975.