Stanger-Hall, Kathrin F.; Lloyd, James E. & Hillis, David M. (2007): Phylogeny of North American fireflies (Coleoptera: Lampyridae): Implications for the evolution of light signals. Mol. Phylogenet. Evol.45(1): 33-49. doi:10.1016/j.ympev.2007.05.013 (HTML abstract)