^ Kölligan, Daniel (2017–2018) “Chapter XX: Proto-Indo-European”, in Klein, Jared S., Joseph, Brian D., Fritz, Matthias, editors, Handbook of Comparative and Historical Indo-European Linguistics: An International Handbook (Handbücher zur Sprach- und Kommunikationswissenschaft [Handbooks of Linguistics and Communication Science]; 41.2), Berlin, Boston: De Gruyter Mouton, →ISBN, § The lexicon of Proto-Indo-European, page 2264: “*(h₃)i̯ebʰ-”
^ Adams, Douglas Q. (2013) “yäp-”, in A Dictionary of Tocharian B: Revised and Greatly Enlarged (Leiden Studies in Indo-European; 10), Amsterdam, New York: Rodopi, →ISBN, pages 537-538
^ Edelʹman, D. I. (2011) “*i̯ab-”, in Etimologičeskij slovarʹ iranskix jazykov [Etymological Dictionary of Iranian Languages] (in Russian), volume IV, Moscow: Vostochnaya Literatura, pages 60-62
^ Benzing, Johannes (1983) “byʾβy-”, in Chwaresmischer Wortindex, Wiesbaden: Harrasowitz, page 185
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