Não informado. (2016). Research Program on Soils of the Tropics, Annual Report. North Carolina State University, Soil Science Department.
Citação do estilo Chicago (17ª ed.)Não informado. Research Program on Soils of the Tropics, Annual Report. Raleigh, NC: North Carolina State University, Soil Science Department, 2016.
Citação MLA (8ª ed.)Não informado. Research Program on Soils of the Tropics, Annual Report. North Carolina State University, Soil Science Department, 2016.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.