Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.
Citação do estilo Chicago (17ª ed.)Não informado. Philippine Journal of Soils. Manila: Department of Agriculture and Natural Resources.
Citação MLA (8ª ed.)Não informado. Philippine Journal of Soils. Department of Agriculture and Natural Resources.
警告：这些引文格式不一定是100％准确.