MORGAN, R. (1995). Soil erosion and conservation.-- Ed.2. Longman.
Lua i Stíl Chicago (17ú heag.)MORGAN, R.P.C. Soil Erosion and Conservation.-- Ed.2. England: Longman, 1995.
Lua MLA (9ú heag.)MORGAN, R.P.C. Soil Erosion and Conservation.-- Ed.2. Longman, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.