APA (7th ed.) Citation

De Geus, J. G. (1973). Fertilizer guide for the tropics and subtropics. Centre D'E'tude De L'Azote.

Chicago Style (17th ed.) Citation

De Geus, Jan G. Fertilizer Guide for the Tropics and Subtropics. Geneva: Centre D'E'tude De L'Azote, 1973.

MLA (9th ed.) Citation

De Geus, Jan G. Fertilizer Guide for the Tropics and Subtropics. Centre D'E'tude De L'Azote, 1973.