↑Williams, P. H. (1998) An annotated checklist of bumble bees with an analysis of patterns of description (Hymenoptera: Apidae, Bombini), Bulletin of the Natural History Museum (Entomology), vol. 67, no. 1
↑ (2006) , Manuscript, Checklist of Apoidea of North America... - 12 Oktubre 2006
↑ (2006) , website, Bombus - bumblebees of the world
↑Thorp, Robbin W. / Shepherd, M. D., D. M. Vaughan, and S. H. Black, eds. (2005) Species Profile: Bombus franklini, Red List of Pollinator Insects of North America
↑ 7.07.1Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D. (ed.) (2011). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 24 Septyembre 2012.CS1 maint: multiple names: authors list (link) CS1 maint: extra text: authors list (link)
↑ITIS Bees: World Bee Checklist. Ruggiero M. (project leader), Ascher J. et al., 28 Septyembre 2009