Não informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
Citação do estilo Chicago (17ª ed.)Não informado. Tropical Soils Research Program, Annual Report. Raleigh, NC: North Carolina State University, Soil Science Department.
Citação MLA (8ª ed.)Não informado. Tropical Soils Research Program, Annual Report. North Carolina State University, Soil Science Department.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.