Template:Olson et al., 2003
- Olson, P.D., Cribb, T.H., Tkach, V.V., Bray, R.A. & Littlewood, D.T.J. 2003. Phylogeny and classification of the Digenea (Platyhelminthes: Trematoda). International Journal for Parasitology 33(7): 733–755. DOI: 10.1016/S0020-7519(03)00049-3. Full article (PDF).