West, Ronald R. “Treatise Online, No. 20, Part E, Revised, Volume 4, Chapter 2A: Introduction to the Fossil Hypercalcified Chaetetid-Type Porifera (Demospongiae)”. Treatise Online (January 25, 2011). Accessed April 28, 2024. https://journals.ku.edu/treatiseonline/article/view/4137.