APA (7th ed.) Citation

Giller, K. E. (1991). Nitrogen fixation in tropical cropping systems. C.A.B. International.

Chicago Style (17th ed.) Citation

Giller, K. E. Nitrogen Fixation in Tropical Cropping Systems. United Kingdom: C.A.B. International, 1991.

MLA (9th ed.) Citation

Giller, K. E. Nitrogen Fixation in Tropical Cropping Systems. C.A.B. International, 1991.