World Register of Marine Species.

WoRMS Editorial Board, (2020). World Register of Marine Species English language

FishBase.

Froese, R., Pauly, D., (2020). FishBase English language

AlgaeBase.

Guiry, M. D., Guiry, G. M., (2020). AlgaeBase National University of Ireland, Galway, Ireland. English language

Continuing expansion of non-indigenous crayfish species in Northern Europe: first established spiny-cheek crayfish Faxonius limosus (refinesque, 1817) population in Estonia.

Kaldre, K., Paaver, T., Hurt, M., Gross, R., (2020). BioInvasions Records 9(1), 127-132. Regional Euro-Asian Biological Invasions Centre (REABIC), Helsinki, Finland. English language

Pomacea canaliculata.

USA, Global Invasive Species Database (2020) External factsheets, Global Invasive Species Database, 6 pp., English language

NAS - nonindigenous aquatic species.

Daniel, W. M. (2020) External factsheets, U.S. Geological Survey, Nonindigenous Aquatic Species Database, 1 pp., English language

Pomacea canaliculata (Lamarck, 1822).

Ponder, W. F., Hallan, A., Shea, M. E., Clark, S. A., Richards, K., Klunzinger, M. W., Kessner, V. (2020) External factsheets, The Australian Museum, 1 pp., English language

Nonindigenous Aquatic Species Database.

US Geological Survey, (2020). Nonindigenous Aquatic Species Database US Geological Survey, Gainesville, Florida, USA. English language

Cymbopogon schoenanthus (camel grass).

CABI, (2020). Invasive Species Compendium(85275662) CABI, Wallingford, UK. English language

Database on Introductions of Aquatic Species (DIAS).

FAO, (2020). Database on Introductions of Aquatic Species (DIAS) Food and Agricultural Organization of the United Nations, Rome, Italy. English language