Andrew Sihler, New comparative grammar of Greek and Latin, p. 412, and CarlDarlingBuck, Comparative grammar of Greek and Latin. In particular, quadri- has
Umbria. Guida d'Italia. Milano: Touring Club Italiano. 2004 (意大利语). Buck, CarlDarling. A Grammar Of Oscan And Umbrian: With A Collection Of Inscriptions
and Archaeology. 2021, 4: 43–57 [2022-01-06]. (原始内容存档于2022-01-06). DarlingBuck, Carl. Language and the Sentiment of Nationality. American Political Science