↑Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, บ.ก. (2013). "กลุ่มภาษาบอลต์". Glottolog 2.2. Leipzig: Max Planck Institute for Evolutionary Anthropology.
↑Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, บ.ก. (2013). "บอลต์ตะวันออก". Glottolog 2.2. Leipzig: Max Planck Institute for Evolutionary Anthropology.
↑Nordhoff, Sebastian; Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, บ.ก. (2013). "ปรัสเซียเก่า". Glottolog 2.2. Leipzig: Max Planck Institute for Evolutionary Anthropology.
↑"Lietuviai Pasaulyje" (PDF) (in Lithuanian). Lietuvos statistikos departamentas. Retrieved 5 May 2015.
↑Latvian at Ethnologue (18th ed., 2015) (subscription required)
Standard Latvian language at Ethnologue (18th ed., 2015) (subscription required)
Latgalian language at Ethnologue (18th ed., 2015) (subscription required)
↑Gimbutas, Marija (1963). The Balts. Ancient peoples and places 33. London: Thames and Hudson. สืบค้นเมื่อ 3 December 2011.
↑Ringe, D.; Warnow, T.; Taylor, A. (2002). "Indo-European and computational cladistics". Transactions of the Philosophical Society. 100: 59–129. doi:10.1111/1467-968X.00091.
↑Dini, P.U. (2000). Baltų kalbos. Lyginamoji istorija [Baltic languages. Comparative history] (ภาษาลิทัวเนีย). Vilnius: Mokslo ir enciklopedijų leidybos institutas. p. 61. ISBN5-420-01444-0.