(原始内容存档于2013-12-10). Baker, V., et al. 2015. "Fluvial geomorphology on Earth-like planetary surfaces: a review". Geomorphology. 245, 149–182. Carr, M. 1996. in Water
Processes in Geomorphology. San Francisco: W.H. Freeman and Co. Bierman, R. B; Montgomery, David R. (2014). Key Concepts in Geomorphology. United States:
(原始内容存档于2018-11-01). Baker, V., et al. 2015. Fluvial geomorphology on Earth-like planetary surfaces: a review. Geomorphology. 245, 149–182. Carr, M. 1996. in Water
則形成對稱的豬背嶺。因為地貌是漸變的,所以用傾角來區分是任意的,並且在文獻中可能會有不同的定義 。 Cotton, C.A. (1952) Geomorphology An Introduction to the Study of Landforms. John Wiley and Sons, New