BioStor
 | The type species of the genera and subgenera of bees Grace A Sandhouse (1943) Proceedings of the United States National Museum 92(3156): 519-619 |
 | The subgeneric division of the genus Bombus Latreille (Hymenoptera: Apidae) O W Richards (1968) Bulletin of the British Museum (Natural History), Entomology 22: 209-276 |
 | THE SUBGENERIC DIVISIONS OF THE GENUS BOMBUS HYMENOPTERA APIDAE O W Richards (1968) Bulletin of The British Museum (Natural History) Entomology 22: 211-276 |
 | Classification of the Apidae (Hymenoptera) Charles D Michener (1990) University of Kansas Science Bulletin 54(4): 75-164 |