Dent, D., & Young, A. (1981). Soil survey and land evaluation. George Alber and Unwin.
Lua i Stíl Chicago (17ú heag.)Dent, David, agus Anthony Young. Soil Survey and Land Evaluation. London: George Alber and Unwin, 1981.
Lua MLA (9ú heag.)Dent, David, agus Anthony Young. Soil Survey and Land Evaluation. George Alber and Unwin, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.