McKnight, T. L., & Hess, D. Physical geography: A landscape appreciation (6a ed.).
Lua i Stíl Chicago (17ú heag.)McKnight, Tom L., agus Darrel Hess. Physical Geography: A Landscape Appreciation. 6a ed.
Lua MLA (8ú heag.)McKnight, Tom L., agus Darrel Hess. Physical Geography: A Landscape Appreciation. 6a ed.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.