Gardiner, D. T., & Miller, R. W. (2008). Soils in our environment (11th ed.). Pearson/Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Gardiner, Duane T., agus Raymond W. Miller. Soils in Our Environment. 11th ed. Upper Saddle River, N.J: Pearson/Prentice Hall, 2008.
Lua MLA (9ú heag.)Gardiner, Duane T., agus Raymond W. Miller. Soils in Our Environment. 11th ed. Pearson/Prentice Hall, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.