BioStor
 | A revision of the bembicine wasps of America north of Mexico Johnbernard Parker (1917) Proceedings of The United States National Museum 52: 1-155 |
 | An exploratory analysis of cladistic relationships within the superfamily Apoidea, with special reference to sphecid wasps (Hymenoptera) B A Alexander (1992) Journal of Hymenoptera Research 1: 25-61 |