Ferguson, 1969. A Revision of the Moths of the Subfamily Geometrinae of America North of Mexico (Insecta, Lepidoptera). Bulletin of the Peabody Museum of Natural History. no. 29, p.
(70).
(1)
Ferguson, D.C. 1985. The Moths of North America. Fascicle 18.1 Geometroidea, Geometridae (Part), Geometrinae.
(5)