Não informado. Soil management abstracts. International Board for Soil Research and Management.
Lua i Stíl Chicago (17ú heag.)Não informado. Soil Management Abstracts. Bangkok: International Board for Soil Research and Management.
Lua MLA (8ú heag.)Não informado. Soil Management Abstracts. International Board for Soil Research and Management.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.