Johnson, J. G. (1975). Late Early Devonian brachiopods from the Disappointment Bay Formation, Lowther Island, Arctic Canada. <em>Journal of Paleontology.</em> 49(6): 947-978.[details] Available for editors
Traits (2025). Spirinella ultima Johnson, 1975 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1774558 on 2025-05-28
Marine Species Traits editorial board (2025). Marine Species Traits. Spirinella ultima Johnson, 1975 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1774558 on 2025-05-28
original descriptionJohnson, J. G. (1975). Late Early Devonian brachiopods from the Disappointment Bay Formation, Lowther Island, Arctic Canada. <em>Journal of Paleontology.</em> 49(6): 947-978.[details] Available for editors