Bickerman-Martens, Kalyn, Beth Swartz, Ron Butler, and Francis Drummond. “Documenting the Diversity, Distribution, and Status of Maine Bumble Bees: The Maine Bumble Bee Atlas and Citizen Scientists”. Maine Policy Review 26, no. 2 (January 1, 2017): 43–49. Accessed September 5, 2026. https://journals.maine.edu/mpr/article/view/2365.