Lambdin, P.; Hodgson, C.; Grant, J.

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 2007, 1615, 29–39.