1. Hwang S. W. "Analytical study of the Roughness of Alluvial ·channels " unpublished M.S. thesis. Civil Engineering Dept. Colorado State University Fort Collins Colorado. 1958.
2. Rouse H. and S. Ince. "History of Hydraulics " Iowa Institute of Hydraulic Research Iowa City Iowa. 1957.
3. On the Flow of Water in Open Channels and Pipes;Manning R.;Trans. Inst. C. E. Ireland,1890
4. Kolupaila S. "Hidraulik (Hydraulics) in Lithuanian language Kempten Bavaria. 1947.
5. Turbulent Flow;Prandtl L.;(uberdie ausgebildete Turbulenz). Proc. of 2nd International Congress of Appl. Mech., Zurich,1949