“A Dichotomic Key of the Males of Thoracobombus Dalla Torre, Subgenus of Bombus Latreille, Present in Italy”. Bollettino di zoologia agraria e bachicoltura 38, no. 1 (September 23, 2024): 27–38. Accessed July 27, 2026. https://test-ojs-unimi-it.archicoop.it/index.php/bzab/article/view/26487.