Παραπομπή APA

Giller, K. E. (2001). Nitrogen Fixation in Tropical cropping systems (2.). CAB International.

Παραπομπή Chicago Style

Giller, Ken E. Nitrogen Fixation in Tropical Cropping Systems. 2. U.K: CAB International, 2001.

Παραπομπή MLA

Giller, Ken E. Nitrogen Fixation in Tropical Cropping Systems. 2. CAB International, 2001.