Williams, J.B. (1995). "Phylogeny of the Polystomatidae (Platyhelminthes, Monogenea), with particular reference to Polystoma integerrimum". International Journal for Parasitology. 25 (4): 437–441. doi:10.1016/0020-7519(94)00138-E. PMID7635619.
nih.gov
pubmed.ncbi.nlm.nih.gov
Williams, J.B. (1995). "Phylogeny of the Polystomatidae (Platyhelminthes, Monogenea), with particular reference to Polystoma integerrimum". International Journal for Parasitology. 25 (4): 437–441. doi:10.1016/0020-7519(94)00138-E. PMID7635619.