Toews, David P.L.; Brelsford, Alan; Irwin, Darren E. (2011). "Hybridization between Townsend's Dendroica townsendi and blackt-hroated green warblers D. virens in an avian suture zone". Journal of Avian Biology. 42 (5): 434–446. doi:10.1111/j.1600-048X.2011.05360.x.