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- Emmel, J.F. & Pratt, G.F. 1998. New Subspecies of Lycaeninae from California and a Type Locality Restriction for Chrysophanus cupreus W.H. Edwards (Lep.: Lycaenidae). In Systematics of Western North American Butterflies 52: 661–680. ISBN 978-0-9655370-2-5.