Iwama, R.E., Oceguera-Figueroa, A., de Carle, D., Manglicmot, C., Erséus, C., Miles, N.M.-S., Siddall, M.E. & Kvist, S. (2019)

Broad geographic sampling and DNA barcoding do not support the presence of Helobdella stagnalis (Linnaeus, 1758) (Clitellata: Glossiphoniidae) in North America

. Zootaxa, 4671 (1), 1–25.