Mallory, J. P.; Adams, D. Q. (2006), “*wl(o)p-”, in The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World (Oxford Linguistics), New York: Oxford University Press, →ISBN, page 138
Watkins, Calvert (1985), “wl̥p-ē-”, in The American Heritage Dictionary of Indo-European Roots, Boston: Houghton Mifflin Harcourt, page 78
Gamkrelidze, Th. V.; Ivanov, V. V. (1995), “wl̥pʰ-”, in Indo-European and the Indo-Europeans. A Reconstruction and Historical Analysis of a Proto-Language and Proto-Culture. Part I: The Text (Trends in linguistics. Studies and monographs; 80), Berlin, New York: Mouton de Gruyter, page 432 of 432, 433
^ Martirosyan, Hrach (2010), “aɫuēs”, in Etymological Dictionary of the Armenian Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 8), Leiden and Boston: Brill, page 42
↑ 3.03.13.23.33.43.53.6Trubachyov, Oleg, editor (1988), “*lisa I”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages] (in Russian), issue 15 (*lětina – *lokačь), Moscow: Nauka, →ISBN, page 137
^ Derksen, Rick (2015), “lapė”, in Etymological Dictionary of the Baltic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 13), Leiden, Boston: Brill, →ISBN, page 274: “PIE *h₂lōp-s, *h₂lop-”
^ Derksen, Rick (2015), “vilpišys”, in Etymological Dictionary of the Baltic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 13), Leiden, Boston: Brill, →ISBN, page 505: “PIE *ulp-”
^ Heikkilä, Mikko (2017), “The origin of the Finno-Saami word ilves ʼlynxʼ”, in (Seeming) Irregularity as a Clue to the Origin of Words, Helsinki: Tampere University, page 5
^ Derksen, Rick (2008), “*lisa”, in Etymological Dictionary of the Slavic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 4), Leiden; Boston: Brill, →ISBN, →ISSN, page 279: “m. ā ‘fox’”
^ De Vaan, Michiel (2008), “volpēs”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 688: “PIE *(H)ulp-i- ‘marten, cat, vel sim.’”
^ Beekes, Robert S. P. (2010), “ἀλώπηξ”, in Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), volume I, with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN, page 78: “IE *h₂lop- ‘fox’”