Plowright, C.m.s.; Plowright, R.c.; Williams, Paul H. (1997-12-01). "Replacement of Bombus Muscorum by Bombus Pascuorum in Northern Britain". The Canadian Entomologist. 129 (6): 985–990. doi:10.4039/Ent129985-6. ISSN1918-3240. S2CID85874043.
Plowright, C.m.s.; Plowright, R.c.; Williams, Paul H. (1997-12-01). "Replacement of Bombus Muscorum by Bombus Pascuorum in Northern Britain". The Canadian Entomologist. 129 (6): 985–990. doi:10.4039/Ent129985-6. ISSN1918-3240. S2CID85874043.
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Plowright, C.m.s.; Plowright, R.c.; Williams, Paul H. (1997-12-01). "Replacement of Bombus Muscorum by Bombus Pascuorum in Northern Britain". The Canadian Entomologist. 129 (6): 985–990. doi:10.4039/Ent129985-6. ISSN1918-3240. S2CID85874043.