Huggett, R., 2007, 2. trükk, Fundamentals of geomorphology Google'i raamat
cuny.edu
geo.hunter.cuny.edu
e.g., DTM intro page, Hunter College Department of Geography, New York NY.
doi.org
Roe, Gerard H.; Whipple, Kelin X.; Fletcher, Jennifer K. (september 2008). "Feedbacks among climate, erosion, and tectonics in a critical wedge orogen". American Journal of Science. 308 (7): 815–842. DOI:10.2475/07.2008.01. ISSN0002-9599.
Roe, Gerard H.; Whipple, Kelin X.; Fletcher, Jennifer K. (september 2008). "Feedbacks among climate, erosion, and tectonics in a critical wedge orogen". American Journal of Science. 308 (7): 815–842. DOI:10.2475/07.2008.01. ISSN0002-9599.