British Geomorphological Research Group. (1981). Earth Surface Processes and Landforms. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)British Geomorphological Research Group. Earth Surface Processes and Landforms. Sussex, Inglaterra: John Wiley & Sons, 1981.
Lua MLA (8ú heag.)British Geomorphological Research Group. Earth Surface Processes and Landforms. John Wiley & Sons, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.