World Register of Marine Species (WoRMS)
Kroh, A.; Mooi, R. (2026). World Echinoidea Database. Spatangus californicus H.L. Clark, 1917. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=513547 on 2026-08-30
Clark, H. L. (1917). Hawaiian and other Pacific Echini. Memoirs of the Museum of Comparative Zoology, Harvard College. 46: 85-283.