Tham khảo Chó sói bình nguyên Bắc Mỹ

  1. ↑ Say, T. et al. (1823) Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20: by order of the Hon. J.C. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party. Philadelphia: H.C. Carey and I. Lea... p. 169-173.
  2. 1 2 Wozencraft, W. C. (2005). “Order Carnivora”. Trong Wilson, D. E.; Reeder, D. M. (biên tập). Mammal Species of the World: A Taxonomic and Geographic Reference . Johns Hopkins University Press. tr. 575–577. ISBN 978-0-8018-8221-0. OCLC 62265494. url=https://books.google.com/books?id=JgAMbNSt8ikC&pg=PA576
  3. ↑ Prince Maximilian of Wied-Neuwied (1841). Reise in das innere Nord-Amerika in den Jahren 1832 bis 1834. 2. Coblenz. tr. 95.[Trip to the interior of North America 1832 to 1834]
  4. ↑ Mech, L. (1970). “Appendix A – Subspecies of wolves – North American”. The Wolf: The Ecology and Behavior of an Endangered Species. Doubleday. ISBN 978-0-307-81913-0. Great Plains wolf; buffalo wolf; loafer. This is another extinct subspecies. It once extended throughout the Great Plains from southern Manitoba and Saskatchewan southward to northern Texas.
  5. ↑ Busch, R. (2007). “The Wolf in Human Culture”. Wolf Almanac: A Celebration Of Wolves And Their World. Lyons Press. tr. 124. ISBN 978-1-59921-069-8.
  6. ↑ Bergman, C. (2003). “10 - Partial List of Extinctions”. Wild Echoes: Encounters with the Most Endangered Animals in North America. University of Illinois Press. tr. 256. ISBN 0-252-07125-5.
  7. ↑ Cook (ngày 6 tháng 7 năm 1964). “News Release” (PDF). Fish and Wildlife Service. United States Department of the Interior. tr. I. Truy cập ngày 26 tháng 1 năm 2018. Extinct Mammals of the United States: Plains wolf, Canus lupus nubilus (1926) — Great Plains
  8. ↑ A Biological Survey of North Dakota, Vernon, B., (1926), North American Fauna: Number 49: pp. 150–156.
  9. ↑ Nowak, R. (2003). “9-Wolf Evolution and Taxonomy”. Trong Mech, L. David; Boitani, Luigi (biên tập). Wolves: Behaviour, Ecology and Conservation. University of Chicago Press. tr. 245. ISBN 0-226-51696-2.
  10. ↑ Another look at wolf taxonomy Nowak, R.M. 1995. Pp. 375–397 in L.N. Carbyn, S.H. Fritts and D.R. Seip, eds.Ecology and conservation of wolves in a changing world: proceedings of the second North American symposium on wolves. Canadian Circumpolar Institute, University of Alberta, Edmonton, Canada.

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