एपीए उद्धरण

Hartiradh Singh. (1989). Foreign Trade review. Indian Institute of Foreign trade.

शिकागो स्टाइल उद्धरण

Hartiradh Singh. Foreign Trade Review. Delhi: Indian Institute of Foreign trade, 1989.

एमएलए उद्धरण

Hartiradh Singh. Foreign Trade Review. Indian Institute of Foreign trade, 1989.