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↑ Rothwell G. W. và K. C. Nixon (2006). "How does the inclusion of fossil data change our conclusions about the phylogenetic history of euphyllophytes." Int. J. Plant Sci. 167(3): 737-749
↑ Kramer K. U. (1990). Notes on the Higher Level Classification of the Recent Ferns trong K. Kubitzki, K. U. Kramer và P. S. Green. The Families and Genera of Vascular Plants: Pteridophytes and Gymnosperms. New York, Springer-Verlag. 1: 49-52
