Frederick Thomas Elworthy, The evil eye. An account of this ancient and wide spread superstition, London, J. Murray, (lire en ligne)
Roger E. Axtell, Do's and Taboos of Humor Around the World: Stories and Tips from Business and Life, Wiley, (ISBN9780471254034, lire en ligne), 92
(en) Smithsonian Institution Bureau of American Ethnology Garrick Mallery, Introduction to the Study of Sign Language Among the North American Indians ..., Govt. Print. Off., (lire en ligne)
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Michael Andor Brodeur, « That hand symbol you're seeing everywhere? Not OK », The Boston Globe, (lire en ligne, consulté le )
(en) Cornelia Müller, Alan Cienki, Ellen Fricke et Silva Ladewig, Body - Language - Communication. Volume 2, Walter de Gruyter GmbH & Co KG, (ISBN978-3-11-030202-8, lire en ligne)
(en) Thaddeus F. Tuleja, Curious Customs: The Stories Behind More Than 300 Popular American Rituals, BBS Publishing Corporation, (ISBN978-1-57866-070-4, lire en ligne)
(en) David Sherlock et William Zajac, « A Fourteenth-Century Monastic Sign List From Bury St Edmunds Abbey », Alan Sutton Publishing, Gloucester, vol. 36, no 4, . (ISSN0262-6004)