Global Invasive Species Database - Styela clava (tunicate)
https://www.iucngisd.org/gisd/species.php?sc=951
IUCN. Species Survival Commission. Invasive Species Specialist Group.
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Google Images - Clubbed Tunicate
https://www.google.com/search?q=%22clubbed%20tunicate%22&tbm=ischGoogle.
Identify an Aquatic Invasive Species: Clubbed Tunicate
https://www.dfo-mpo.gc.ca/species-especes/profiles-profils/clubbedtunicate-asci…Fisheries and Oceans Canada.
Invasive Sea Squirt (Styela clava) Fact Sheet
https://niwa.co.nz/oceans/faq/invasive-sea-squirt-styela-clava-fact-sheetNational Institute of Water and Atmospheric Research (New Zealand).
Invasive Species Compendium - Styela clava
https://doi.org/10.1079/cabicompendium.62274CAB International.
Invasive Tunicate Identification Card: Colonial Tunicate and Club Tunicate
PDF1.6 MBhttps://wsg.washington.edu/wordpress/wp-content/uploads/Invasive-Tunicate-Ident…University of Washington. Washington Sea Grant Program.
National Exotic Marine and Estuarine Species Information System (NEMESIS) - Styela clava
https://invasions.si.edu/nemesis/species_summary/159337Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.
NEANS Panel Online Guide - Club Tunicate
https://www.northeastans.org/index.php/home/online-guide-to-ans/species-informa…Northeast Aquatic Nuisance Species Panel.
NOBANIS: Invasive Alien Species Fact Sheet - Styela clava
2010PDF66 KBhttps://www.nobanis.org/globalassets/speciesinfo/s/styela-clava/styela-clava.pdfEuropean Network on Invasive Alien Species.
See also: NOBANIS Fact Sheets for invasive alien species of the European region, covering both animals and plants, as well as microorganisms
Non-native Species Information: Leathery Sea Squirt
https://www.nonnativespecies.org/non-native-species/information-portal/view/3430Great Britain Non-Native Species Secretariat.
Priority Species: Tunicate
https://invasivespecies.wa.gov/priorityspecies/tunicate/Washington State Recreation and Conservation Office. Washington Invasive Species Council.
Styela clava: The Clubbed Tunicate - A Type Of Sea Squirt
Jun 2013PDF674 KBhttps://www.mpi.govt.nz/dmsdocument/3596-styela-clava-the-clubbed-tunicate-a-ty…New Zealand Ministry for Primary Industries.
The Exotics Guide: Non-native Marine Species of the North American Pacific Coast - Styla clava
Sep 2011https://www.exoticsguide.org/styela_clavaSan Francisco Estuary Institute; Center for Research on Aquatic Bioinvasions.