Spencer, W. K. (1914). The Evolution of the Cretaceous Asteroidea. <em>Philosophical Transactions of the Royal Society B: Biological Sciences.</em> 204(303-312): 99-177., available online athttps://royalsocietypublishing.org/doi/pdf/10.1098/rstb.1914.0004 page(s): 118, pl. 10 fig. 19,20, pl. 15 fig. 20-24 [details]
Mah, C.L. (2024). World Asteroidea Database. Metopaster undulatus Spencer, 1914 †. Accessed at: https://www.marinespecies.org/Asteroidea/aphia.php?p=taxdetails&id=1394062 on 2024-08-23
original descriptionSpencer, W. K. (1914). The Evolution of the Cretaceous Asteroidea. <em>Philosophical Transactions of the Royal Society B: Biological Sciences.</em> 204(303-312): 99-177., available online athttps://royalsocietypublishing.org/doi/pdf/10.1098/rstb.1914.0004 page(s): 118, pl. 10 fig. 19,20, pl. 15 fig. 20-24 [details]