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Ballard, W. B., L. A. Ayres, C. L. Gardner, and J. W. Foster.  1991.  Den site 
     activity patterns of Gray Wolves, Canis lupus, in southcentral 
     Alaska.  Canadian Field-Nat. 105:497-504.

Folk, G. E., Jr.  1964.  Daily physiological rhythms of carnivores exposed to 
     extreme changes in arctic daylight.  Federation Proceedings 23:1221-1228.

Haber, G. C.  1977.  Socio-ecological dynamics of wolves and prey in a 
     subarctic ecosystem.  Ph.D. Thesis, University of British Columbia, 
     Vancouver, British Columbia.

Harrington, F. H., and L. D. Mech.  1982.  Patterns of homesite attendance in 
     two Minnesota wolf packs.  Pages 81-105 in Wolves of the world: 
     perspectives of behavior, ecology, and conservation.  Edited by F. H. 
     Harrington and P. C. Paquet.  Noyes, Park Ridge, New Jersey.

Kolenosky, G. B., and D. H. Johnston.  1967.  Radio-tracking timber wolves in 
     Ontario.  American Zoologist 7:289-303.

Mech, L. D.  1988.  The Arctic Wolf: Living with the pack.  Voyageur Press.  
     Stillwater, Minnesota.  128 pages.

Mech, L. D.  1993.  Resistance of young wolf pups to inclement weather.  
     Journal of Mammalogy. 74:485-486.

Mech, L. D.  1995.  A ten-year history of the demography and productivity of an 
     arctic wolf pack.  Arctic 48:329-332.

Mech, L. D. and J. M. Packard.  1990.  Use of wolf den over several centuries.  
     Canadian Field-Naturalist 104:484-485.

Murie, A.  1944.  The Wolves of Mount McKinley.  Fauna of the National Parks of 
     the U.S., Fauna Series number 5.  U.S. Government Printing Office, 
     Washington, District of Columbia.

Vila, C, V. Urios, and J. Castroviejo.  1995.  Observations on the daily 
     activity patterns of the Iberian wolf.  Pages 335-340 in Ecology 
     and conservation of wolves in a changing world. Edited by Carbyn, 
     L.N., S. H. Fritts, and D.R. Seip.  Canadian Circumpolar Institute, 
     Occasional Publication number 35, Edmonton, Alberta.