APA (7th ed.) Zitazioa

Giller, K. E. (1993). Nitrogen fixation in tropical cropping: Systems. C.A.B,I.

Chicago Style (17th ed.) Zitazioa

Giller, Ken E. Nitrogen Fixation in Tropical Cropping: Systems. Wallingford: C.A.B,I, 1993.

MLA (9th ed.) Zitazioa

Giller, Ken E. Nitrogen Fixation in Tropical Cropping: Systems. C.A.B,I, 1993.