APA Citation

Held, R. B., & Clawson, M. (1965). Soil conservation in perspective. Baltimore, Maryland: The Johns Hopkins Press.

Trích dẫn kiểu Chicago

Held, R. Burnell., và Marion Clawson. Soil Conservation in Perspective. Baltimore, Maryland: The Johns Hopkins Press, 1965.

MLA Citation

Held, R. Burnell., và Marion Clawson. Soil Conservation in Perspective. Baltimore, Maryland: The Johns Hopkins Press, 1965.

Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.