एपीए उद्धरण

Defries, R. S., & Silver, C. S. (1991). One earth, one future: Our changing global environment.

शिकागो स्टाइल उद्धरण

Defries, Ruth S., और Cheryl Simon Silver. One Earth, One Future: Our Changing Global Environment. New Delhi, Affiliated East-West Press, 1991.

एमएलए उद्धरण

Defries, Ruth S., और Cheryl Simon Silver. One Earth, One Future: Our Changing Global Environment. 1991.