Nudo mariposa alpino (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Nudo mariposa alpino" in Spanish language version.

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Smith, Bruce; Allen Padgett (1996). On Rope; North American Vertical Rope Techniques (New Revised edición). Huntsville, Ala.: National Speleological Society. p. 49. ISBN 1-879961-05-9.
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.

A.A. Burger (1914). «Rope and Its Uses». Extension Bulletin 24 (Ames: Iowa State College of Agricultural and Mechanic Arts) XIII (8): 24-25. Consultado el 9 de septiembre de 2010.