↑Taylor, T.N.; Taylor, E.L. & Krings, M. (2009), Paleobotany, The Biology and Evolution of Fossil Plants (Edisi 2nd), Amsterdam; Boston: Academic Press, ISBN978-0-12-373972-8, pp. 259-261
↑Granoff, J.A.; Gensel, P.G. & Andrews, H.N. (1976), "A new species of Pertica from the Devonian of Eastern Canada", Palaeontographica Abteilung B, 155 (5–6): 119–128, cited in Gerrienne, P. (1997), "The fossil plants from the Lower Devonian of Marchin (northern margin of Dinant Synclinorium, Belgium). V. Psilophyton genseliae sp. nov., with hypotheses on the origin of Trimerophytina", Review of Palaeobotany and Palynology, 98 (3–4): 303–324, doi:10.1016/S0034-6667(97)00010-9
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