1. Acorn JH (1992) The historical development of geographic color variation among dune Cicindela in western Canada. In: Noonan GE, Ball GE, Stork NE (eds) The biogeography of ground beetles of mountains and islands. Intercept Press, Andover, p 256
2. Acorn JH (2001) Tiger Beetles of Alberta: Killers on the Clay. University of Alberta Press, Edmonton, Stalkers on the Sand
3. Acorn JH (2004) Grassland tiger beetles in Canada. Arthropods of Canadian Grasslands, Biological Survey of Canada 10:6-13
4. Acorn JH (2011) Sand hill arthropods in grasslands. In: Floate KD (ed) Arthropods of Canadian grasslands (volume 2): inhabitants of a changing landscape. Biological Survey of Canada, Ottawa, pp 25–43
5. Amadon D (1949) The seventy-five per cent rule for subspecies. The Condor 51:250–258