APA aipamena

(1993). Improvement of soil fertility. China: International Foundation for Science (IFS).

Chicago Style aipamena

Improvement of Soil Fertility. China: International Foundation for Science (IFS), 1993.

MLA aipamena

Improvement of Soil Fertility. China: International Foundation for Science (IFS), 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.