Handbook of Formal Languages (1997), p. 6 (页面存档备份,存于互联网档案馆). Indo-European tree with Armeno-Aryan, separate from Greek. [2010-09-27]. (原始内容存档于2018-05-14).
(2005), "Indocentrism", in Bryant, Edwin; Patton, Laurie L. (eds.), The Indo-Aryan Controversy. Evidence and inference in Indian history, Routledge Beckwith
1962), pp. 254–262 Indo-European family tree, showing Indo-European languages and sub branches Image of Indo-European migrations from the Armenian Highlands