Boutkan et Kossmann, « On the Etymology of 'Silver' », North-Western European Language Evolution, vol. 3, , p. 3–15 (DOI10.1075/nowele.38.01bou, lire en ligne, consulté le )
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Robert Lawrence Trask, The Dictionary of Historical and Comparative Linguistics, Psychology Press, (ISBN1-57958-218-4, lire en ligne), p. 366
Hans Henrich Hock et Brian D. Joseph, Language History, Language Change, and Language Relationship: An Introduction to Historical and Comparative Linguistics, Walter de Gruyter, (ISBN3-11-014784-X, lire en ligne), p. 254
Boutkan et Kossmann, « On the Etymology of 'Silver' », North-Western European Language Evolution, vol. 3, , p. 3–15 (DOI10.1075/nowele.38.01bou, lire en ligne, consulté le )
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Dahl, « Feature/Chapter 138: Tea », The World Atlas of Language Structures Online, Max Planck Digital Library (consulté le )