Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira da Rocha, R.; Swalla, B.J.; Turon, X. (2021). Ascidiacea World Database.
Ctenicella hupferi Hartmeyer, 1909. Accessed at: http://marinespecies.org/ascidiacea/aphia.php?p=taxdetails&id=252651 on 2021-03-01