manuscript: Checklist of Apoidea of North America... - 04-Aug-2005; Griswold, T., and J. S. Ascher. 2005. Checklist of Apoidea of North America (including Central America and the Caribbean) (as-yet unpublished manuscript from 2004+)
database: NODC Taxonomic Code;
website: Hymenoptera Name Server version 0.03 4.x.2002; http://atbi.biosci.ohio-state.edu:8880/hymenoptera/nomenclator.home_page
Michener, Charles D. 2000-01-01. The Bees of the World. The Johns Hopkins University Press. Baltimore, Maryland, USA. xiv + 913. 0-8018-6133-0. .
Michener, Charles D. 2007-01-01. The Bees of the World, Second Edition. The Johns Hopkins University Press. Baltimore, Maryland, USA. xvi + 953. 0-8018-8573-6. .
Eardley, C. D. 1987-12-01. Entomology Memoir, No. 70. . . iii + 20. 0 621 10777 8. .
