Karafit, S. J.; Rothwell, G. W.; Stockey, R. A.; Nishida, H. (2006). "Evidence for sympodial vascular architecture in a filicalean fern rhizome: Dickwhitea allenbyensis gen. et sp. nov.(Athyriaceae)". International Journal of Plant Sciences. 167 (3): 721–727. doi:10.1086/501036. S2CID85348245.
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Rothwell, G.W.; Stockey, R.A. (2008). "Phylogeny and evolution of ferns: a paleontological perspective". Biology and evolution of ferns and lycophytes. Cambridge University Press. p. 332-366. doi:10.1017/CBO9780511541827.014. ISBN978-0-521-87411-3.
DeVore, M. L.; Nyandwi, A.; Eckardt, W.; Bizuru, E.; Mujawamariya, M.; Pigg, K. B. (2020). "Urticaceae leaves with stinging trichomes were already present in latest early Eocene Okanogan Highlands, British Columbia, Canada". American Journal of Botany. 107 (10): 1449–1456. doi:10.1002/ajb2.1548. PMID33091153. S2CID225050834.
DeVore, M. L.; Nyandwi, A.; Eckardt, W.; Bizuru, E.; Mujawamariya, M.; Pigg, K. B. (2020). "Urticaceae leaves with stinging trichomes were already present in latest early Eocene Okanogan Highlands, British Columbia, Canada". American Journal of Botany. 107 (10): 1449–1456. doi:10.1002/ajb2.1548. PMID33091153. S2CID225050834.
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Karafit, S. J.; Rothwell, G. W.; Stockey, R. A.; Nishida, H. (2006). "Evidence for sympodial vascular architecture in a filicalean fern rhizome: Dickwhitea allenbyensis gen. et sp. nov.(Athyriaceae)". International Journal of Plant Sciences. 167 (3): 721–727. doi:10.1086/501036. S2CID85348245.
DeVore, M. L.; Nyandwi, A.; Eckardt, W.; Bizuru, E.; Mujawamariya, M.; Pigg, K. B. (2020). "Urticaceae leaves with stinging trichomes were already present in latest early Eocene Okanogan Highlands, British Columbia, Canada". American Journal of Botany. 107 (10): 1449–1456. doi:10.1002/ajb2.1548. PMID33091153. S2CID225050834.