Clark, H. L. (1928). The sea-lilies, sea-stars, brittle-stars and sea-urchins of the South Australian Museum. <em>Records of the South Australian Museum.</em> 3(4): 361-482., available online athttps://www.biodiversitylibrary.org/page/41025502 page(s): 396 [details]
Mah, C.L. (2024). World Asteroidea Database. Echinaster glomeratus var. extremus H.L. Clark, 1928. Accessed at: https://www.marinespecies.org/Asteroidea/aphia.php?p=taxdetails&id=990027 on 2024-08-19
original descriptionClark, H. L. (1928). The sea-lilies, sea-stars, brittle-stars and sea-urchins of the South Australian Museum. <em>Records of the South Australian Museum.</em> 3(4): 361-482., available online athttps://www.biodiversitylibrary.org/page/41025502 page(s): 396 [details]