BioStor
 | Some Psammocharidae from Singapore (1938) Proceedings of The Entomological Society of Washington 40: 236-249 |
 | Nearctic wasps of the subfamilies Pepsinae and Ceropalinae H Townes (1957) Bulletin of the United States National Museum 209: 1-286 |
 | 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 |