एपीए उद्धरण

Babu,Vithal V. (1991). Trade and Technology directory of India. Economy and Trade.

शिकागो स्टाइल उद्धरण

Babu,Vithal V. Trade and Technology Directory of India. New Delhi: Economy and Trade, 1991.

एमएलए उद्धरण

Babu,Vithal V. Trade and Technology Directory of India. Economy and Trade, 1991.