Citations: Achterberg, C. v. 1981: [Betrem, J. G.] Entomologische Berichten, Amsterdam 41 (9), B15 10146a, pp. 134-141, Portr. + Schr.verz.
Anonym 1980: [Betrem, J. G.] The Bulletin of the Entomological Society of Canada = Le Bulletin de la Société d'Entomologie de Canada, Ottawa 12 (3), B15: 11766, pp. 51
Gilbert, P. 2007: A Source Book for Biographical Literature on Entomologists Leiden, Backhuys Publishers, 694 S., A 2972, pp. 49