World Register of Marine Species (WoRMS)
Shenkar, N.; Gittenberger, A.; Lambert, G.; Rius, M.; Moreira da Rocha, R.; Swalla, B.J.; Turon, X. (2026). Ascidiacea World Database. Polycarpa sobria (Sluiter, 1904). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=251067 on 2026-08-29
Sluiter, C. P. (1904). Die Tunicaten der Siboga-Expedition. Part 1. Die socialen und holosomen Ascidien. Siboga-Exped. 56a: 1-126.