Dyfyniad APA

Eckholm, E. P. (1982). Down to earth: Environment and human needs. Affiliated East-West Press.

Dyfyniad Arddull Chicago

Eckholm, Erik P. Down to Earth: Environment and Human Needs. New Delhi: Affiliated East-West Press, 1982.

Dyfyniad MLA

Eckholm, Erik P. Down to Earth: Environment and Human Needs. Affiliated East-West Press, 1982.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.