BioStor
 | Revision of the parasitic chalcidoid flies of the genera Homalotylus Mayr and Isodromus Howard, with descriptions of two closely related genera. P H Timberlake (1919) Proceedings of the United States National Museum 56: 133-194 |
 | The insect fauna of ninebark, Physocarpus opulifolius (Rosaceae) A G Wheeler and E R Hoebeke (1985) Proceedings of the Entomological Society of Washington 87: 356-370 |
 | Field guide to recently introduced species of coccinellidae (Coleoptera) in North America, with a revised key to north American genera of coccinellini R D Gordon and N Vandenberg (1991) Proceedings of the Entomological Society of Washington 93: 845-867 |
 | Larval key to genera and selected species of North America Coccinellidae (Coleoptera) (1994) Proceedings of the Entomological Society of Washington 96: 387-412 |