Gaya APA

Geus, J, D. (1973). Fertilizer Guide for the Tropics and Subtropics (Second Edition). Zurich: Centre D\'etude De L\'azote.

Gaya MLA

Geus, J.G., De. "Fertilizer Guide for the Tropics and Subtropics". Second Edition Zurich: Centre D\'etude De L\'azote, 1973. Teksbook.