Colla, S., Richardson, L., & Williams, P. (2011). Bumble bees of the eastern United States. U.S. Dept. of Agriculture Pollinator Partnership.
Chicago Style (17th ed.) CitationColla, Sheila, Leif Richardson, and Paul Williams. Bumble Bees of the Eastern United States. Washington, D.C.: U.S. Dept. of Agriculture Pollinator Partnership, 2011.
MLA (9th ed.) CitationColla, Sheila, et al. Bumble Bees of the Eastern United States. U.S. Dept. of Agriculture Pollinator Partnership, 2011.
Warning: These citations may not always be 100% accurate.