Gaya APA

Ayanaba,A, ., Dart,P.J, . (1977). Biological Nitrogen Fixation in Farming Systems of The Tropics . Chicester: John Wiley and Sons,.

Gaya MLA

Ayanaba,A, ., Dart,P.J, . "Biological Nitrogen Fixation in Farming Systems of The Tropics". Chicester: John Wiley and Sons,, 1977. Text.