[1]    C. H. Edwards and D. E. Penney, Elementary Differential Equations with Boundary Value Problems, 6th ed., Pearson International Edition, 2009,   pp. 137, 533-537.

[2]    D.C.Giancoli,PhysicsPrincipleswithApplications,6thed.,Pearson International Edition, 2005, pp. 296-297.

[3]    F. M. S. Lima and P. Arun, An accurate formula for the period of a simple pendulum oscillating beyond the small angle regime, Amer. J. Phys.  74(10) (2006), 892-895.

[4]    Jan Benacka, Three spreadsheet models of a simple pendulum, Spreadsheets in Education (eJSiE) 3(1) (2008), Article 5.

[5]    L. P. Fulcher and B. F. Davis, Theoretical and experimental study of the motion of the simple pendulum, Amer. J. Phys. 44 (1976), 51-55.

[6]    Jan Benacka, Power series solution to the pendulum equation, International Journal of Mathematical Education in Science and Technology 40(8) (2009), 1109-1117. DOI; 10.1080/00207390902971981.

[7]    M. I. Qureshi, M. Rafat and S. I. Azad, The exact equation of motion of a simple pendulum of arbitrary amplitude: a hypergeometric approach, European J. Phys. 31 (2010), 1485-1497.

[8]    C. J. Smith, A Degree Physics, Part I: The General Properties of Matter, Edward Arnold ltd., London, 1960.

[9]    R. A. Nelson and M. G. Olsson, The pendulum-rich physics from a simple system, Amer. J. Phys. 54(2) (1986), 112-121.

[10]    Pendulum (mathematics), in Wikipedia, the free encyclopedia, retrieved 11/16/2014, from http://en.wikilpedia.org/wiki/Pendulum%28mathematics%29.

 [11]    R. B. Kidd and S. L. Fogg, A simple formula for the large-angle pendulum period, Phys. Teach. 40 (2002), 81-83.

[12]    M. I. Molina, Simple linearization of the Simple pendulum for any amplitude, Phys. Teach. 35 (1997), 489-490.

[13]    R. L. Burden and J. D. Faires, Numerical Analysis, PWS Publishers, 3rd ed., 1985, pp. 184-188.

[14]    E. Thompson, CE 563 Computational Methods, Class Notes, Colorado State University, 1991.