APA-referens

Ayanaba, A., & Dart, P. J. (1977). BIological nitrogen fixation in farming systems of the tropics. John Wiley and Sons.

Chicago-stil citat

Ayanaba, A., och P J. Dart. BIological Nitrogen Fixation in Farming Systems of the Tropics. New York: John Wiley and Sons, 1977.

MLA-referens

Ayanaba, A., och P J. Dart. BIological Nitrogen Fixation in Farming Systems of the Tropics. John Wiley and Sons, 1977.