Madill, J., & Hovingh, P. (2007).

Freshwater leech (Annelida: Hirudinida) distribution in the Canadian Province of Newfoundland and Labrador and adjacent regions: check-list, new records, new pigmentation forms, and Pleistocene refugia

. Zootaxa, 1657(1), 1–21. https://doi.org/10.11646/zootaxa.1657.1.1