found: LCCN 66-121: His The lemming cycle at Baker Lake, 1964(hdg.: Krebs, Charles J.; usage: Charles J. Krebs)
found: LC data base, 6-20-85(hdg.: Krebs, Charles J.; usage: Charles J. Krebs)
found: University of British Columbia WWW site, Sept. 14, 2012(Charles J. Krebs; professor emeritus, Department of Zoology, retired Dec. 31, 2001)
found: science.ca WWW site, viewed July 21, 2016(Charles J. Krebs; b. Sept. 17, 1936, St. Louis, Mo.; residence: Mayne Island, B.C.; professor of zoology at UBC, 1970-2002)
found: The ecological world view, 2008:t.p. (Charles Krebs)