Eckholm, E. P. (1982). Down to earth: Environment and human needs. Affiliated East-West Press.
استشهاد بنمط شيكاغوEckholm, Erik P. Down to Earth: Environment and Human Needs. New Delhi: Affiliated East-West Press, 1982.
MLA استشهادEckholm, Erik P. Down to Earth: Environment and Human Needs. Affiliated East-West Press, 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.