Studies in Romance Lexicology, Based on a Collection of Late Latin Documents From Ravenna (A. Do 445-700) (North Carolina Studies in the Romance Languages and Literatures) (en Inglés)
Charles Merritt Carlton studies in detail some forty words that he has found in the texts published by Tjader in his Die nichtliterarischen lateinischen Papyri Italiens aus der Zeit 445-700, vol. I (Lund, 1955).