Lambdin, P., Hodgson, C. & Grant, J. (2007)

Description of the adult male elongate hemlock scale, Fiorinia externa Ferris (Coccoidea: Diaspididae), with notes on the seasonal development of the species on eastern hemlock, Tsuga canadensis (L.) Carrieré (Pinaceae), in the southern Appalachian region (U.S.A.)

. Zootaxa, 1615 (1), 29–39.