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A. Bogomolny, Tower of Hanoi from $\textit{Interactive Mathematics Miscellany and Puzzles}$  http://www.cut-the-knot.org/recurrence/hanoi.shtml, Accessed 18 February 2016  \vspace{2mm}  Benjamin, A. T. (2009). $\textit{Discrete Mathematics}$. Chantilly, Virginia: The Great Courses.  \vspace{2mm}  http://db.math.ust.hk/notes_download/elementary/algebra/ae_A8.pdf