Julien, P. Y. An introduction to physical geography and the environment (3a ed.).
Lua i Stíl Chicago (17ú heag.)Julien, Pierre Y. An Introduction to Physical Geography and the Environment. 3a ed.
Lua MLA (8ú heag.)Julien, Pierre Y. An Introduction to Physical Geography and the Environment. 3a ed.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.