(1986). Processes in physical geography.
Lua i Stíl Chicago (17ú heag.)Processes in Physical Geography. 1986.
Lua MLA (9ú heag.)Processes in Physical Geography. 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)