For Athyrium
Kato, M. 1993c. Athyrium. In Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Volume 2, pteridophytes and gymnosperms. Oxford Univ. Press, New York, NY. 475 pp.
Kelloff, C.L., and C.R. Werth. 1998. Allozyme evidence for genetic divergence between two eastern North American varieties (angustum and asplenioides) of the Athyrium filix-femina complex [abstract]. Amer. J. Bot. 85 [supplement]: 101.
Kelloff, C.L., J. Skog, L. Adamkewicz, and C.R. Werth. 2002. Differentiation of eastern North American Athyrium filix-femina taxa: evidence from allozymes and spores. Amer. Fern J. 92: 185-213.
Kramer, K.U., and P.S. Green. 1990. Pteridophytes and Gymnosperms. In K. Kubitzki, ed., The families and genera of vascular plants. Springer-Verlag, Berlin.
Moran, R.C., J.G. Hanks, and M. Sundue. 2019. Phylogenetic relationships of Neotropical lady ferns (Athyriaceae),with a description of Ephemeropteris, gen. nov. Taxon 2019
Wang, He, & Kato in FoC (2013)
Wei, R., A. Ebihara, Y.-M. Zhu, C.-F. Zhao, S. Hennequin, X.-C. Zhang. 2018. A total-evidence phylogeny of the lady fern genus Athyrium Roth (Athyriaceae) with a new infrageneric classification. Molec. Phogen. Evol. 119: 25-36.