Rutgers University. (1916). Soil science. Williams & Wilkins.
Citação do estilo Chicago (17ª ed.)Rutgers University. Soil Science. Baltimore, Md: Williams & Wilkins, 1916.
Citação MLA (8ª ed.)Rutgers University. Soil Science. Williams & Wilkins, 1916.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.