Hudson, N. (1981). Soil conservation. New York: Cornell Univ. Press.
Trích dẫn kiểu ChicagoHudson, Norman. Soil Conservation. New York: Cornell Univ. Press, 1981.
MLA引文Hudson, Norman. Soil Conservation. New York: Cornell Univ. Press, 1981.
警告：這些引文格式不一定是100％准確.