Lambdin, P., Hodgson, C. and 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 (Oct. 2007), 29–39. DOI:https://doi.org/10.11646/zootaxa.1615.1.3.