↑Needham (1868–1957) en Westfall (1916–2003) waren de auteurs van het oorspronkelijke werk A manual of the dragonflies of North America (Anisoptera)
↑(en) Needham, J.G., Westfall, M.J. & May, M.L. (2000). Dragonflies of North America, revised edition of A manual of the dragonflies of North America (Anisoptera) (1955)
↑(en) Ware, J.L.,Pilgrim, E., May, M.L., Donnelly, T.W. & Tennessen, K. (2017).Phylogenetic relationships of North American Gomphidae and their close relatives. Systematic Entomology 42(2):347–358.DOI:10.1111/syen.12218.