Rutgers University. (1916). Soil science. Williams & Wilkins.
Lua i Stíl Chicago (17ú heag.)Rutgers University. Soil Science. Baltimore, Md: Williams & Wilkins, 1916.
Lua MLA (8ú heag.)Rutgers University. Soil Science. Williams & Wilkins, 1916.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.