Wilson, J.S.; Wilson, L.E.; Loftis, L.D.; Griswold, T. 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist. 70(2): 198-207.

Wilson, J.S.; Wilson, L.E.; Loftis, L.D.; Griswold, T. 2010. The montane bee fauna of north central Washington, USA, with floral associations. Western North American Naturalist. 70(2): 198-207.