APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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