एपीए उद्धरण

Chopra R N. (1991). Advanced indexing and abstracting practices. Royal pub.

शिकागो स्टाइल उद्धरण

Chopra R N. Advanced Indexing and Abstracting Practices. New Delhi: Royal pub, 1991.

एमएलए उद्धरण

Chopra R N. Advanced Indexing and Abstracting Practices. Royal pub, 1991.