"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". In Alan K. Bowman; Edward Champlin; Andrew Lintott (eds.). The Cambridge Ancient History: X, The Augustan Empire, 43 B.C. – A.D. 69. Vol. 10 (2nd ed.). Cambridge University Press. pp. 527–528. ISBN0-521-26430-8.
