Kroh, A.; Mooi, R. (2021). World Echinoidea Database. Hipponoe antiqua Duncan & Sladen †. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: http://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1034632 on 2025-05-25
Marine Species Traits editorial board (2025). Marine Species Traits. Hipponoe antiqua Duncan & Sladen †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1034632 on 2025-05-25
basis of recordRowe, F. W. E. (1974). Catalogue of the Sladen Collection in the Royal Albert Memorial Museum, Exeter, Devon. <em>Biological Journal of the Linnean Society.</em> 6/3: 179-243., available online athttps://doi.org/10.1111/j.1095-8312.1974.tb00722.x page(s): 185, 201 [details]