Webber, P. J. (1979). High altitude geoecology. Westview Press.
Lua i Stíl Chicago (17ú heag.)Webber, Patrick J. High Altitude Geoecology. Boulder: Westview Press, 1979.
Lua MLA (9ú heag.)Webber, Patrick J. High Altitude Geoecology. Westview Press, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.