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Banks, H.P. (1975), "Reclassification of Psilophyta", Taxon, 24: 401–413, doi:10.2307/1219491, p. 405
Kenrick, Paul & Crane, Peter R. (1997), The Origin and Early Diversification of Land Plants: A Cladistic Study, Washington, D.C.: Smithsonian Institution Press, ISBN978-1-56098-730-7
Parent's taxonomic references:
Authority: Sinnott (1935) ex Cavalier-Smith (1998)
Sinnott, E.W. (1935), Botany: Principles and Problems (3rd pán.), New York: McGraw-Hill, OCLC610937719