Friend, P. F., P. D. Alexander-Marrack, J. Nicholson, og A. K. Yeats. “ Sedimentary Structures and Fossils”. Meddelelser om Grønland 206, no. 2 (januar 1, 1976): 91 pp. . Set september 27, 2024. https://tidsskrift.dk/meddrgroenland/article/view/143410.