APA (7e ed.) Bronvermelding

Tropical Agriculture Research Centre, Japan. N�orin Suisansh�o, & Otsuka, H. (1988). Characteristics and genesis of volcanic ash soils in the Philippines. Tropical Agriculture Research Center.

Chicago (17e ed.) Bronvermelding

Tropical Agriculture Research Centre, Japan. N�orin Suisansh�o, en Hiroo Otsuka. Characteristics and Genesis of Volcanic Ash Soils in the Philippines. Ibaraki, Japan: Tropical Agriculture Research Center, 1988.

MLA (9e ed.) Bronvermelding

Tropical Agriculture Research Centre, et al. Characteristics and Genesis of Volcanic Ash Soils in the Philippines. Tropical Agriculture Research Center, 1988.