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APA Citation
Sheffield, S. L., & Sumrall, C. D. (2017). generic revision of the Holocystitidae of North America (Diploporita, Echinodermata) based on universal elemental homology. Journal of paleontology, 91, 755–766. http://access.bl.uk/ark:/81055/vdc_100047554242.0x00004a