Butterfly loop (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Butterfly loop" in English language version.

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Marbach, Georges; Bernard Tourte (2002). Alpine Caving Techniques; A Complete Guide to Safe and Efficient Caving. English edition translated and adapted by Melanie Alspaugh. Allschwil, Switzerland: Speleo Projects, Caving Publications International. p. 73. ISBN 3-908495-10-5.
Drew, J.M. (1913). "Some Knots and Splices". Irrigation Age. 28 (1). Chicago: D.H. Anderson Pub. Co.: 212–220.

Burger, A.A. (1914). "Rope and Its Uses". Extension Bulletin 24. XIII (8). Ames: Iowa State College of Agricultural and Mechanic Arts: 24–25. Retrieved 2010-09-09.