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There are many methods for solving butterfly theorem. This paper derives the butterfly theorem by using the properties of similar triangles and theorem of intersecting chords. This technique is the simple one that can be used for solving some Euclidean geometry problems.
 Alexander Bogomolny. 2016. Intersecting Chord Theorem. Retrieved 3 December 2016 from http://www.cut-the-knot.org/IntersectingChordsTheorem.shtml
 H.S.M. Coxeter and S.L. Greitzer, Geometry Revisited, New York, 1967.