Govedich, F. R.; Bain, B. A.; Moser, W. E.; Gelder, S. R.; Davies, R. W.; Brinkhurst, R. O. (2009). Chapter 12 - Annelida (Clitellata): Oligochaeta, Branchiobdellida, Hirudinida, and Acanthobdellida. Pp. 385-436 in James H. Thorp and Alan P. Covich (eds): Ecology and Classification of North American Freshwater Invertebrates. Third edition. Academic Press.
Govedich, F. R.; Bain, B. A.; Moser, W. E.; Gelder, S. R.; Davies, R. W.; Brinkhurst, R. O.
2009
Chapter 12 - Annelida (Clitellata): Oligochaeta, Branchiobdellida, Hirudinida, and Acanthobdellida. Pp. 385-436 in James H. Thorp and Alan P. Covich (eds): Ecology and Classification of North American Freshwater Invertebrates. Third edition. Academic Press.