Follett, R. F., & Stewart, B. A. (1985). Soil erosion and crop productivity. American Society of Agronomy.
Lua i Stíl Chicago (17ú heag.)Follett, R. F., agus B. A. Stewart. Soil Erosion and Crop Productivity. Madison, Wis., U.S.A: American Society of Agronomy, 1985.
Lua MLA (9ú heag.)Follett, R. F., agus B. A. Stewart. Soil Erosion and Crop Productivity. American Society of Agronomy, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.