Lodberg-Holm, Hanna Kavli (2018) Beverens biologi og forvaltning. Norwegian Beaver Project, University of Southeast Norway Don E. Wilson, Thomas E. Lacher, Jr, Russell A. Mittermeier, , pp. 987, pub. July 2016, ISBN 978-84-941892-3-4 Halley, D.J. & Bevanger, K. (2005) . NINA Rapport 21. 61 s.