Common Ringlet (Coenonympha tullia) alighted on white sock. Photo by T.D. Hatten Common Ringlet (Coenonympha tullia)

Glassberg, J. 2001. Butterflies through Binoculars: A field guide to the butterflies of North America. Oxford University Press, New York, New York.
Guppy, C. S., Shepard, J. H. 2001. Butterflies of British Columbia. University of British Columbia Press, Vancouver, British Columbia.
Poeciwicz, A. 2006. Modeling landscape change and evaluating ecological effects of landscape composition and configuration in Northern Idaho. Dissertation, University of Idaho, Moscow, ID.
Pyle, R. M. 2002. The Butterflies of Cascadia. Seattle Audobon Society, Seattle, Washington.
The North American Butterfly Association (NABA) checklist & English names of North American butterflies (Second Edition). 2001. North American Butterfly Association, Morristown, New Jersey.