Williams, P.H., Dorji, P., Ren, Z., Xie, Z. and Orr, M. 2022. Bumblebees of the hypnorum-complex world-wide including two new near-cryptic species (Hymenoptera: Apidae). European Journal of Taxonomy. 847, 1 (Nov. 2022), 46–72. DOI:https://doi.org/10.5852/ejt.2022.847.1981.