Koch, John T. (2006). "Galatian language". Dalam John T. Koch. Celtic culture: a historical encyclopedia. Volume III: G—L. Santa Barbara, California: ABC-CLIO. hlm. 788. ISBN1-85109-440-7. Late classical sources—if they are to be trusted—suggest that it survived at least into the 6th century AD.
glottolog.org
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, ed. (2023). "Galatia". Glottolog 4.8. Jena, Jerman: Max Planck Institute for the Science of Human History.Pemeliharaan CS1: Tampilkan editors (link)