Gerrard, J. (1992). Soil Geomorphology: An Integration of Pedology and Geomorphology. Chapman & Hall.
Lua i Stíl Chicago (17ú heag.)Gerrard, John. Soil Geomorphology: An Integration of Pedology and Geomorphology. London: Chapman & Hall, 1992.
Lua MLA (9ú heag.)Gerrard, John. Soil Geomorphology: An Integration of Pedology and Geomorphology. Chapman & Hall, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.