Brixhe, Claude (2008). 〈Phrygian〉. Woodard, Roger D. 《The Ancient Languages of Asia Minor》. Cambridge University Press. 69–80쪽. ISBN0-521-68496-X. "Unquestionably, however, Phrygian is most closely linked with Greek." (p. 72).
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, 편집. (2023). 〈Phrygian〉. 《Glottolog 4.8》. Jena, Germany: Max Planck Institute for the Science of Human History.