El Qot, G. (2010). Upper Cretaceous echinoids from the Galala Plateaux, North Eastern Desert, Egypt. <em>Revue de Paléobiologie.</em> 29: 261-291. page(s): 270-271; pl. 4: figs 1a-d [details]
Kroh, A.; Mooi, R. (2021). World Echinoidea Database. Phymosoma kassabi El Qot, 2010 †. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1033937 on 2024-07-09
Marine Species Traits editorial board (2024). Marine Species Traits. Phymosoma kassabi El Qot, 2010 †. Accessed at: https://www.marinespecies.org/traits./aphia.php?p=taxdetails&id=1033937 on 2024-07-09
original descriptionEl Qot, G. (2010). Upper Cretaceous echinoids from the Galala Plateaux, North Eastern Desert, Egypt. <em>Revue de Paléobiologie.</em> 29: 261-291. page(s): 270-271; pl. 4: figs 1a-d [details]