Brixhe, Claude (2008). "Phrygian". Dalam Woodard, Roger D. The Ancient Languages of Asia Minor. Cambridge University Press. hlm. 69–80. ISBN978-0-521-68496-5. "Unquestionably, however, Phrygian is most closely linked with Greek." (p. 72).
Obrador-Cursach, Bartomeu (2019-12-01). "On the place of Phrygian among the Indo-European languages". Journal of Language Relationship (dalam bahasa Rusia). 17 (3–4): 243. doi:10.31826/jlr-2019-173-407.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan) "With the current state of our knowledge, we can affirm that Phrygian is closely related to Greek."
ethnologue.com
"Bahasa Yunani Kuno". www.ethnologue.com (dalam bahasa Inggris). SIL Ethnologue.
glottolog.org
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, ed. (2023). "Ancient Greek". Glottolog 4.8. Jena, Jerman: Max Planck Institute for the Science of Human History.Pemeliharaan CS1: Tampilkan editors (link)