von Koenigswald, W., C. Widga, and U. Göhlich. “New Mammutids (Proboscidea) from the Clarendonian and Hemphillian of Oregon – a Survey of Mio-Pliocene Mammutids from North America”. Bulletin of the Museum of Natural History, University of Oregon, vol. 30, Sept. 2023, https://journals.oregondigital.org/nat_history/article/view/6004.