British Geomorphological Research Group. (1981). Earth Surface Processes and Landforms. John Wiley & Sons.
Citação do estilo Chicago (17ª ed.)British Geomorphological Research Group. Earth Surface Processes and Landforms. Sussex, Inglaterra: John Wiley & Sons, 1981.
Citação MLA (8ª ed.)British Geomorphological Research Group. Earth Surface Processes and Landforms. John Wiley & Sons, 1981.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.