Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.
Chicagoスタイル(17版)引用形式Não informado. Philippine Journal of Soils. Manila: Department of Agriculture and Natural Resources.
MLA(8版)引用形式Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.
警告: この引用は必ずしも正確ではありません.