Peel, J.S, and J.M Hurst. “Late Ordovician and Early Silurian Stratigraphy of Washington Land, Western North Greenland”. Rapport Grønlands Geologiske Undersøgelse 100 (December 31, 1980): 18–24. Accessed November 27, 2024. https://geusjournals.org/index.php/rapggu/article/view/7688.