Cockerell, T. D. A. (1924). Bees of the genus Andrena in the collection of the California Academy of Sciences. Zenodo.
Citazione stile Chigago Style (17a edizione)Cockerell, Theodore D. A. Bees of the Genus Andrena in the Collection of the California Academy of Sciences. Zenodo, 1924.
Citatione MLA (9a ed.)Cockerell, Theodore D. A. Bees of the Genus Andrena in the Collection of the California Academy of Sciences. Zenodo, 1924.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.