Freeman, Philip (1999). The Survival of Etruscan. Page 82: "Oscan graffiti on the walls of Pompeii show that non-Latin languages could thrive in urban locations in Italy well into the 1st century CE."
Cooley, Alison; Burnett, Andrew M. (2002). Becoming Roman, writing Latin? : literacy and epigraphy in the Roman West. Journal of Roman Archaeology. ISBN1-887829-48-2. OCLC54951998.