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Georgiev, Vladimir Ivanov (1981): Introduction to the History of the Indo-European Languages. Sofia: Bulgarian Academy of Sciences., s. 156. Sitat: «The Proto-Greek region included Epirus, approximately up to Αυλών in the north including Paravaia, Tymphaia, Athamania, Dolopia, Amphilochia, and Acarnania), west and north Thessaly (Hestiaiotis, Perrhaibia, Tripolis, and Pieria), i.e. more or less the territory of contemporary northwestern Greece).»
«China: The advent of bronze casting», Encyclopædia Britannica Online. Sitat: «Stylistic evidence, such as the sharp angles, flat bottoms, and strap handles of certain Qijia clay pots (in Gansu; c. 2250–1900 bc), has led some scholars to posit an early sheet- or wrought-metal tradition possibly introduced from the west by migrating Indo-European peoples...»
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Joseph, B. (2001): «Ancient Greek»Arkivert 24. november 2016 hos Wayback Machine. i: Garry, J. et al., red.: Facts about the World's Major Languages: An Encyclopedia of the World's Major Languages, Past and Present.
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Koch, John T (2010): Celtic from the West (PDF), s. 190 (se kart 9.2 Celtic expansion from Hallstatt/La Tene central Europe)
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Watkins, Calvert (2000): «Indo-European and the Indo-Europeans», The American Heritage Dictionary of the English Language, 4. utg., Houghton Mifflin Company, arkivert fra originalen den 1. mars 2009
Watkins, Calvert (2000): «Indo-European and the Indo-Europeans». Sitat: «A large number of kinship terms have been reconstructed. They are agreed in pointing to a society that was patriarchal, patrilocal (the bride leaving her household to join that of her husband’s family), and patrilineal (descent reckoned by the male line). ‘Father’ and ‘head of the household’ are one: pǝter-, with his spouse, the māter-.»
Watkins, Calvert (2000): «Indo-European and the Indo-Europeans». Sitat: «Yet, for the Indo-European-speaking society, we can reconstruct with certainty the word for 'god', *deiw-os, and the two-word name of the chief deity of the pantheon, *dyeu-pəter- (Latin Iūpiter, Greek Zeus patēr, Sanskrit Dyauṣ pitar, and Luvian Tatis Tiwaz).»
Holmberg, Anders; Platzack, Christer (2005): «The Scandinavian languages» i: The Comparative Syntax Handbook, red. Guglielmo Cinque & Richard S. Kayne. Oxford and New York: Oxford University Press. Utdrag ved Durham UniversityArkivert 3. desember 2007 hos Wayback Machine. (PDF)
«Languages Spoken At Home» (PDF), arkivert fra originalen den 25. mars 2009 hos Wayback Machine, fra Australian Government Office of Multicultural Interests
Joseph, B. (2001): «Ancient Greek»Arkivert 24. november 2016 hos Wayback Machine. i: Garry, J. et al., red.: Facts about the World's Major Languages: An Encyclopedia of the World's Major Languages, Past and Present.
