McKnight, T. L. (1984). Physical geography: A landscape appreciation. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)McKnight, Tom Lee. Physical Geography: A Landscape Appreciation. Englewood Cliffs, NJ: Prentice-Hall, 1984.
Lua MLA (9ú heag.)McKnight, Tom Lee. Physical Geography: A Landscape Appreciation. Prentice-Hall, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.