1. Cochran, W.G. and Cox G.M., 1957.Experimental Design, Wiley, New York, NY, USA.
2. Fil’chakov, P.F., 1970.Computational and Graphical Methods in the Applied Mathematics, Naukova Dumka, Kiev, USSR.
3. Oxtoby, E., 1987,Spun Yarn Technology, Butterworths, London .
4. Truevtsev, N.N.,1977.Praperties of Open-end Spun Yarn, Leningrad Institute of Technology Named after Lensovet, Leningrad, USSR.
5. Zotikov, V.E., and Budnikov, I. V., 1958.Basics of Spinning, Gizlegprom, Moscow, USSR.