For Huperzia
Björk, C.R. 2020. Notes on the Holarctic species of Huperzia (Lycopodiaceae), with emphasis on British Columbia, Canada. Ann. Bot. Fennici 57: 255-278.
Haines, A.A. 2003a. The families Huperziaceae and Lycopodiaceae of New England: a taxonomic and ecological reference. V.F. Thomas Co., Bowdoin, ME. 100 pp.
Øllgaard. 1990. In 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.
Testo, W., A.A. Haines, and A.V. Gilman. 2016. Huperzia continentalis (Lycopodiaceae), a new species of gemmiferous firmoss separated from Huperzia haleakalae. Syst. Bot. 41: 894-901.
Wagner, W.H., and J.M. Beitel. 1993. Lycopodiaceae. 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.
Wikström, N., and P. Kenrick. 2000. Relationships of Lycopodium and Lycopodiella based on combined plastid rbcL gene and trnL intron sequence data. Systematic Bot. 25: 495-510.
Zhang & Iwatsuki. 2013. In FoC.
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