“Morphological Elements Far a Key to Subgenera of Bombus Latreille S.l. and Psithyrus Lepeletier S.l. Present in Italy (Hymenoptera Apidae Bombinae)”. Bollettino di zoologia agraria e bachicoltura 29, no. 1 (December 2, 2024): 1–43. Accessed July 28, 2026. https://test-ojs-unimi-it.archicoop.it/index.php/bzab/article/view/27387.