Colla, Sheila R.; Packer, Laurence (2008-02-08). "Evidence for decline in eastern North American bumblebees (Hymenoptera: Apidae), with special focus on Bombus affinis Cresson". Biodiversity and Conservation. 17 (6): 1379–1391. doi:10.1007/s10531-008-9340-5. ISSN0960-3115. S2CID24635204.
Fisher, Richard M. (August 1987). "Queen-worker conflict and social parasitism in bumble bees (Hymenoptera: Apidae)". Animal Behaviour. 35 (4): 1026–1036. doi:10.1016/S0003-3472(87)80159-8. S2CID53188402.
MacIor, Lazarus Walter (1967). "Pollen-Foraging Behavior of Bombus in Relation to Pollination of Nototribic Flowers". American Journal of Botany. 54 (3): 359–364. doi:10.1002/j.1537-2197.1967.tb06930.x. JSTOR2440764.
Macior, Lazarus Walter (1970-01-01). "The Pollination Ecology of Dicentra cucullaria". American Journal of Botany. 57 (1): 6–11. doi:10.2307/2440374. JSTOR2440374.
Fisher, Richard M. (1983). "Recognition of Host Nest Odour by the Bumblebee Social Parasite Psithyrus ashtoni (Hymenoptera: Apidae)". Journal of the New York Entomological Society. 91 (4): 503–507. JSTOR25009392.
Fisher, Richard M. (1983). "Inability of the Social Parasite Psithyrus ashtoni to Suppress Ovarian Development in Workers of Bombus affinis (Hymenoptera: Apidae)". Journal of the Kansas Entomological Society. 56 (1): 69–73. JSTOR25084374.
MacIor, Lazarus Walter (1967). "Pollen-Foraging Behavior of Bombus in Relation to Pollination of Nototribic Flowers". American Journal of Botany. 54 (3): 359–364. doi:10.1002/j.1537-2197.1967.tb06930.x. JSTOR2440764.
Macior, Lazarus Walter (1970-01-01). "The Pollination Ecology of Dicentra cucullaria". American Journal of Botany. 57 (1): 6–11. doi:10.2307/2440374. JSTOR2440374.
Colla, Sheila R.; Packer, Laurence (2008-02-08). "Evidence for decline in eastern North American bumblebees (Hymenoptera: Apidae), with special focus on Bombus affinis Cresson". Biodiversity and Conservation. 17 (6): 1379–1391. doi:10.1007/s10531-008-9340-5. ISSN0960-3115. S2CID24635204.
Fisher, Richard M. (August 1987). "Queen-worker conflict and social parasitism in bumble bees (Hymenoptera: Apidae)". Animal Behaviour. 35 (4): 1026–1036. doi:10.1016/S0003-3472(87)80159-8. S2CID53188402.
Jepsen, Sarina, et al. "Petition to List the Rusty Patched Bumble Bee Bombis Affinis (Cresson, 1863) as an Endangered Species Under the U.S. Endangered Species Act." The Xerces Society for Invertebrate Conservation, 31 Jan 2013. PDF File. 12 Oct 2015.[1]
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Colla, Sheila R.; Packer, Laurence (2008-02-08). "Evidence for decline in eastern North American bumblebees (Hymenoptera: Apidae), with special focus on Bombus affinis Cresson". Biodiversity and Conservation. 17 (6): 1379–1391. doi:10.1007/s10531-008-9340-5. ISSN0960-3115. S2CID24635204.