APA

Ayanaba A., Dart J., . (1977). Biological nitrogen fixation in farming systems of the tropics. New York: John Wiley & Sons.

Chicago

Ayanaba A, Dart J.p, . 1977. Biological nitrogen fixation in farming systems of the tropics. New York: John Wiley & Sons.

Harvard

Ayanaba A., Dart J., . (1977). Biological nitrogen fixation in farming systems of the tropics. New York: John Wiley & Sons.

MLA

Ayanaba A, Dart J.p, . Biological nitrogen fixation in farming systems of the tropics. New York: John Wiley & Sons. 1977.