APA (7th ed.) Citation

Eckholm, E. P. (1982). Down to earth: Environment and human needs (First edition.). Norton.

Chicago Style (17th ed.) Citation

Eckholm, Erik P. Down to Earth: Environment and Human Needs. First edition. New York: Norton, 1982.

MLA (9th ed.) Citation

Eckholm, Erik P. Down to Earth: Environment and Human Needs. First edition. Norton, 1982.