"Obringa" in Bruzen la Martiniere, Le Grand Dictionnaire Geographique Volume 6, 1737;
Albert Forbiger, Handbuch Der Alten Geographie Volume 3, Mayer und Wigand, 1848, fn (***) p. 126f.
Rüger, C. (2004) [1996]. 〈Germany〉. Alan K. Bowman; Edward Champlin; Andrew Lintott. 《The Cambridge Ancient History: X, The Augustan Empire, 43 B.C. - A.D. 69》 10 2판. Cambridge University Press. 527–528쪽. ISBN0-521-26430-8.
