Hesperopsis libya joaquina Emmel, Emmel & Mattoon 1998

Emmel, Emmel & Mattoon 1998. New subspecies of Hesperiidae (Lepidoptera) from California. Emmel, Thomas C.[Ed]. Systematics of western North American butterflies., Mariposa Press, Gainesville, 1998: i-xviii, 1-878. Chapter pagination: 201-205