Gaya APA

Stevenson, F. (1985). Cycles of Soil : Carbon, Nitrogen, Phosphorus, Sulfur, Micronutrients . New York: John Wiley.

Gaya MLA

Stevenson, F.J.. "Cycles of Soil : Carbon, Nitrogen, Phosphorus, Sulfur, Micronutrients". New York: John Wiley, 1985. Text.