APA (7e ed.) Bronvermelding

Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.

Chicago (17e ed.) Bronvermelding

Não informado. Philippine Journal of Soils. Manila: Department of Agriculture and Natural Resources.

MLA (8e ed.) Bronvermelding

Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.

Let op: Deze citaties zijn niet altijd 100% accuraat.