Philippines (Republic) Bureau of Soil Conservation. Soil erosion. Office of Agricultural Information.
Lua i Stíl Chicago (17ú heag.)Philippines (Republic) Bureau of Soil Conservation. Soil Erosion. [Manila: Office of Agricultural Information.
Lua MLA (9ú heag.)Philippines (Republic) Bureau of Soil Conservation. Soil Erosion. Office of Agricultural Information.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.