Chatterton, Brian D.E. « Sunwaptan (Upper Cambrian) Trilobites of the Cow Head Group, Western Newfoundland, Canada ». Atlantic Geoscience 27, no. 1 (mars 1, 1991). Consulté le juillet 17, 2024. https://journals.lib.unb.ca/index.php/ag/article/view/1722.