1. E. L. Atwood, and D. E. Sonenshine .1967 .Activity of the American dog tick,Dermacentor variabilis(Acarina: Ixodidae), in relation to solar energy changes., Annals of the Entomological Society of America, 60 :354 –362 .
2. V. I. Burachynsky, and T. D. Galloway .1985 .Seasonal dynamics and distribution of American dog tick,Dermacentor variabilis(Say), larvae and nymphs at Birds Hill Park, Manitoba., Canadian Journal of Zoology, 63 :2748 –2755 .
3. G. L. Burnham, 1953 .A study of the helminth parasites of the pocket gophers of Woods, Alfalfa, Grant, and Marshall Counties, Oklahoma., Proceedings of the Oklahoma Academy of Science, 34 :59 –61 .
4. Notes on Moniliformis clarki in North American Squirrels
5. H. Douthitt, 1915 .Studies on the cestode family Anoplocephalidae., Illinois Biological Bulletin, 1 :355 –446 .