Environmental change and the distributions of British bumble bees (Bombus Latr.). Bee World. 1986, 67 (2): 50–61 [2024-02-19]. doi:10.1080/0005772x.1986
(2)1: 213–234. (1851). Descriptions of some new species of short-tongued bees belonging to the genus Nomia. Transactions of the Entomological Society of
ISBN 978-0-300-19572-9 Lubbock, J. Observations on ants, bees, and wasps. IX. Color of flowers as an attraction to bees: Experiments and considerations thereon.. J