Nicholson, J., & Friend, P. F. (1976). Devonian Sediments of East Greenland V. The Central Sequences, Kap Graah Group and Mount Celsius Supergroup. Meddelelser Om Grønland, 206(5), 118 pp., 20 plates. Hentet fra https://tidsskrift.dk/meddrgroenland/article/view/141483