An, Jiandong, Jiaxing Huang, Youquan Shao, Shiwen Zhang, Biao Wang, Xinyu Liu, Jie Wu, and Paul H. Williams. “The Bumblebees of North China (Apidae, Bombus Latreille)”. Zootaxa 3830, no. 1 (July 8, 2014): 1–89. Accessed May 3, 2025. https://www.mapress.com/zt/article/view/zootaxa.3830.1.1.