McFadden, C.S.; Cordeiro, R.; Williams, G.; van Ofwegen, L. (2024). World List of Octocorallia. Umbellula encrinus ambigua Fischer, 1889. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1393587 on 2024-09-09
additional sourceDeichmann, E. (1936). The Alcyonaria of the western part of the Atlantic Ocean. <em>Memoirs of the Museum of Comparative Zoology, Harvard College.</em> 53: 1-317, plates 1-37., available online athttps://www.biodiversitylibrary.org/page/4363633 page(s): 269 [details]