APA (7th ed.) Citation

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.) Citation

Colla, 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.) Citation

Colla, Sheila, et al. Bumble Bees of the Eastern United States. U.S. Dept. of Agriculture Pollinator Partnership, 2011.