References
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- Morgan , L. H. 1868 . The American Beaver and his Works xv – xv . Philadelphia 17–284. 8vo
- Ransom , B. H. 1907 . “ Notes on Parasitic Nematodes, including Descriptions of new Genera and Species and Observations on Life-histories ” . In Circular , U.S. Department of Agriculture, Bureau of Animal Industry . 116
- Travassos , L. 1921 . Contributions à l'étude de la Faune helminthologique du Brésil.—XIII. Essai monographique sur la Famille des Trichostrongylidæ, Leiper, 1909 . Memorias do Instituto Oswaldo Cruz , xiii f. 1