APA (7e ed.) Bronvermelding

AN ULLMANN'S. (1999). An Ullmann's encyclopedia industrial inorganic chemicals and products volume 3: Fertilizers to hydrogen. Wiley-VCH.

Chicago (17e ed.) Bronvermelding

AN ULLMANN'S. An Ullmann's Encyclopedia Industrial Inorganic Chemicals and Products Volume 3: Fertilizers to Hydrogen. Weinheim: Wiley-VCH, 1999.

MLA (9e ed.) Bronvermelding

AN ULLMANN'S. An Ullmann's Encyclopedia Industrial Inorganic Chemicals and Products Volume 3: Fertilizers to Hydrogen. Wiley-VCH, 1999.