APA
Chopra O. P., . (1987). Managerial Economics. New Delhi: Tata McGraw Hill.
Chicago
Chopra O P, . 1987. Managerial Economics. New Delhi: Tata McGraw Hill.
Harvard
Chopra O. P., . (1987). Managerial Economics. New Delhi: Tata McGraw Hill.
MLA
Chopra O P, . Managerial Economics. New Delhi: Tata McGraw Hill. 1987.