BioStor
 | The entomology of the Mid-Alpine zone of Custer County Colorado Cockerell T.d.a. (1893) Transactions of the American Entomological Society 20: 305-370 |
 | List species of Hymenoptera. Collected in Arizona by the University of Kansas entomological expeditions in 1902, 1903, 1904, 1905, and 1906 F H Snow (1907) Transactions of the Kansas Academy of Science 20: 127-139 |
 | The North American bees of the genus Nomia T D.a. Cockerell (1910) Proceedings of the United States National Museum 38: 289-298 |
 | Expedition of the California Academy of Sciences to the Gulf of California in 1921. The Bees (II) T D A Cockerell (1924) Proceedings of the California Academy of Sciences 12: 529-560 |