found: Work cat.: Berg, J.M. Estimating population sizes of the gray jay (perisoreus canadensis) using geographic information systems (GUS) and habitat preferences, 2006
found: Wikipedia, Sept. 18, 2006: (Gray jay, Perisoreus canadensis; This bird is also known as the Camp Robber and the Whiskey Jack; At one time, it was known as the Canada Jay.)
found: Check-list of No. Am. birds, 1998:p. 441 (Perisoreus canadensis (Linnaeus). Gray Jay)
found: Howard and Moore complete cklst. of the birds of the world, 2003:p. 505 (Perisoreus canadensis, Grey jay)
