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เอกสารอ้างอิง [1] Ferdinand P. Beer, E. Russell Johnston Jr. and David F. Mazurek, Vector Mechanics for Engineers: Statics, Tenth Edition in SI Units, McGraw-Hill Companies, Inc., 2013. [2] R.C. Hibbeler, Engineering Mechanics: Statics, 12th Edition in SI Units, Prentice-Hall Inc., 2010. [3] J.L. Meriam, L,G, Kraige, Engineering Mechanics: Statics.. [4] A.Bedford and W. Fowler, Engineering Mechanics: Statics, 5th Edition in SI Units, PrenticeHall Inc., 2008.