Zell, Mary G., and Albert J. Rowell. “Brachiopods of the Holm Dal Formation (late Middle Cambrian), Central North Greenland”. Meddelelser om Grønland. Geoscience 20 (December 31, 1988): 119–144. Accessed November 22, 2024. https://tidsskrift.dk/meddrgroenland_geosci/article/view/139892.