BioStor
 | Descriptions of new North American Hymenoptera in the collection of the American Entomological Society E T Cresson (1879) Transactions of the American Entomological Society 7: 61-136 |
 | New and little-known Hymenoptera taken by Prof. C.H.T. Townsend and Mr. C.M. Barber in New Mexico in 1898 T D A Cockerell (1898) Annals and Magazine of Natural History 2: 448-457 |
 | XVII.—Contributions from the New Mexico biological station.—X. Observations on bees collected at Las Vegas, New Mexico, and in the adjacent mountains. II T D A Cockerell (1901) Annals And Magazine of Natural History 7: 125-134 |
 | The panurgine bees of North Dakota and a new Epeolus (1919) Canadian Entomologist 51: 205-210 |
 | Notes on the structure of Bees (1924) Proceedings of The Entomological Society of Washington 26: 77-85 |
 | A revision of the bee genes Calliopsis and the biology and ecology of C. andreniformis (Hymen-optera: Andrenidae) (1967) Kansas University Science Bulletin 46: 753-936 |