BioStor
 | Some new species of Athysanus and related genera (1916) Entomological News Philadelphia 27: 204-208 |
 | The type species of the genera and subgenera of bees Grace A Sandhouse (1943) Proceedings of the United States National Museum 92(3156): 519-619 |
 | Species-groups and cladistic analysis of the cleptoparastic [sic] bee genus Nomada (Hymenoptera: Apoidea) (1994) University of Kansas Science Bulletin 55: 175-236 |
 | Genus-group names of bees and supplemental family-group names Charles D Michener (1997) Scientific Papers Natural History Museum University of Kansas 1: 1-81 |