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Tirpak, John M.; Giuliano, William M.; Miller, C. Allan . (2005). Nocturnal roost habitat selection by Ruffed Grouse broods. Journal of Field Ornithology, 76(2), 168–174. doi:10.1648/0273-8570-76.2.168 
10.1648/0273-8570-76.2.168