Cita APA

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

Chicago Style Citation

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

Cita MLA

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