Template:Owen & Whidden, 2013
- Owen, R.E.; Whidden, T.L. 2013: Discrimination of the bumble bee species Bombus occidentalis Greene and B. terricola Kirby by morphometric, colour and RAPD variation. Zootaxa 3608(5): 328–344. DOI: 10.11646/zootaxa.3608.5.2