Citazione Stile APA (7a Edizione)

Hudson, N. (1995). Soil conservation (3rd rev. and updated ed.). Iowa State University Press.

Citazione stile Chigago Style (17a edizione)

Hudson, Norman. Soil Conservation. 3rd rev. and updated ed. Ames, Iowa: Iowa State University Press, 1995.

Citatione MLA (9a ed.)

Hudson, Norman. Soil Conservation. 3rd rev. and updated ed. Iowa State University Press, 1995.