Nelson, Rebekah A., and Terry L Griswold. “The Floral Hosts and Distribution of a Supposed Creosote Bush Specialist, Colletes Stepheni Timberlake (Hymenoptera: Colletidae)”. Journal of Melittology, no. 49 (May 12, 2015): 1–12. Accessed May 6, 2024. https://journals.ku.edu/melittology/article/view/4836.