Horton, Robert E.. "Erosional Development of Streams and Their Drainage Basins; Hydrophysical Approach to Quantitative Morphology." Bulletin of the Geological Society of America 56 (1945): 275-370.

Horton, Robert E.. "Erosional Development of Streams and Their Drainage Basins; Hydrophysical Approach to Quantitative Morphology." Bulletin of the Geological Society of America 56, no. 3 (1945): 275-370.