Ford, Derek (2007). "Jovan Cvijić and the founding of karst geomorphology". Environmental Geology. 51 (5): 675–684. doi:10.1007/s00254-006-0379-x.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Migoń, Piotr (2006). "Büdel, J. 1982: Climatic geomorphology. Princeton: Princeton University Press. (Translation of Klima-geomorphologie, Berlin-Stuttgart: Gebrüder Borntraeger, 1977.)". Progress in Physical Geography. 30 (1): 99–103. doi:10.1191/0309133306pp473xx.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
