Litvin, G. (2009), Programming With C++ And Data Structures, 1E, Vikas Publishing House Pvt Ltd, pp. AAL-9 – AAL-10, ISBN 9788125915454. 9788125915454
Szecsei, Denise (2006), Calculus, Career Press, pp. 57–58, ISBN 9781564149145. 9781564149145
Salomon, David; Motta, G.; Bryant, D. (2007), Data Compression: The Complete Reference, Springer, p. 49, ISBN 9781846286032. 9781846286032
Clawson, Calvin C. (1999), Mathematical Mysteries: The Beauty and Magic of Numbers, Da Capo Press, p. 112, ISBN 9780738202594. 9780738202594
Litvin, G. (2009), Programming With C++ And Data Structures, 1E, Vikas Publishing House Pvt Ltd, pp. AAL-9 – AAL-10, ISBN 9788125915454. 9788125915454
Tijms, Henk (2012), Understanding Probability, Cambridge University Press, p. 94, ISBN 9781107658561. 9781107658561
Friedman, Craig; Sandow, Sven (2010), Utility-Based Learning from Data, CRC Press, p. 97, ISBN 9781420011289. 9781420011289
Barbeau, Edward J. (2013), More Fallacies, Flaws & Flimflam, Mathematical Association of America, p. 52, ISBN 9780883855805. 9780883855805