Peel, J.S, and M.R Blaker. “The Small Shelly Fossil Mongolitubulus from the Lower Cambrian of Central North Greenland”. Rapport Grønlands Geologiske Undersøgelse 137 (December 31, 1988): 55–60. Accessed July 3, 2024. https://geusjournals.org/index.php/rapggu/article/view/8015.