Não informado. Soil research. International Society of Soil Science.
Lua i Stíl Chicago (17ú heag.)Não informado. Soil Research. Rome: International Society of Soil Science.
Lua MLA (8ú heag.)Não informado. Soil Research. International Society of Soil Science.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.