Christenhusz, Maarten J. M., Xian-Chun Zhang, and Harald Schneider, 2011: A linear sequence of extant families and genera of lycophytes and ferns. Phytotaxa, vol. 19. 7-54.
Ruggiero, M. A.; Gordon, D. P.; Orrell, T. M.; Bailly, N.; Bourgoin, T.; Brusca, R. C.; Cavalier-Smith, T.; Guiry, M. D.; Kirk, P. M. (2015). Correction: A Higher Level Classification of All Living Organisms. <em>PLoS ONE.</em> 10(4): e0119248.
10.1371/journal.pone.0119248
The Pteridophyte Phylogeny Group, 2016: A community-derived classification for extant lycophytes and ferns. Journal of Systematics and Evolution, vol. 54, no. 6. 563-603.