Jewiss-Gaines, A., Marshall, S.A., Whitworth, T.L. 2012. Cluster flies (Calliphoridae: Polleniinae: Pollenia) of North America. Canadian Journal of Arthropod Identification No. 19, 15 February 2012, available online at http://www.biology.ualberta.ca/bsc/ejournal/jmw_19/jmw_19.html, doi: 10.3752/cjai.2012.19