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^ abcdefghijklmnopqrstuForsyth, Robert; Oldham, Michael; Schueler, Frederick; (2015). "Patera appressa (Say, 1821), an introduced land snail in Ontario, Canada (Mollusca: Gastropoda: Polygyridae)". Check List 11(2): 1583.
^ abcdefghijklmnRobert G. Forsyth, John M. C. Hutchinson & Heike Reise (2001). "Aegopinella nitidula (Draparnaud, 1805) (Gastropoda : Zonitidae) in British Columbia - first confirmed North American record". American Malacological Bulletin 16(1-2): 65-69.
^ abcRobert G. Forsyth & Dwayne A. W. Lepitzki (2015). "Terrestrial snails (Gastropoda: Pulmonata) from Writing-on-Stone Provincial Park, Alberta, Canada". Check List 11(3): 1636. doi: http://dx.doi.org/10.15560/11.3.1636
^ abcdefghijklmnopqrstuvwKristiina Ovaska, Lyle Chichester & Lennart Sopuck (2010). "Terrestrial gastropods from Haida Gwaii (Queen Charlotte Islands), British Columbia, Canada, including description of a new northern endemic slug (Gastropoda: Stylommatophora: Arionidae)". The Nautilus 124(1): 25–33.
^ abcdefghRodrigo B. Salvador, Fred J. Brook, Lara D. Shepherd, Martyn Kennedy (2020). "Molecular phylogenetic analysis of Punctoidea (Gastropoda, Stylommatophora)". Zoosystematics and Evolution 96(2): 397-410.
^ abcdAnnegret Nicolai & Robert G. Forsyth (2020). "Introduced Prophysaon andersonii (J.G. Cooper, 1872) in Quebec, Canada: first record of Prophysaon (Gastropoda, Eupulmonata, Arionoidea) in eastern North America, confirmed by partial-COI gene sequence". Check List 16(2): 307-316. DOI:10.15560/16.2.307
^ abRobert G. Forsyth, Michael J. Oldham, Eric Snyder, Frederick W. Schueler, Ross Layberry (2015). "Forty years later: distribution of the introduced Heath Snail, Xerolenta obvia, in Ontario, Canada (Mollusca: Gastropoda: Hygromiidae)". Check List 11(4): 1-8. doi: 10.15560/11.4.1711