A field guide to the Cidaroid echinoids of the northwestern Atlantic Ocean, Gulf of Mexico, and the Caribbean SeaDOI: info:10.5479/si.00810282.40Smithsonian Institution Press; for sale by the Supt. of Docs., U.S. Govt. Print. Off.67
Phelan, Thomas Francis. 1970. A field guide to the Cidaroid echinoids of the northwestern Atlantic Ocean, Gulf of Mexico, and the Caribbean Sea. Washington: Smithsonian Institution Press; for sale by the Supt. of Docs., U.S. Govt. Print. Off.. In Smithsonian Contributions to Zoology, 40. https://doi.org/10.5479/si.00810282.40.