APA (7th ed.) Citation

Colla, S., Richardson, L., & Williams, P. (2011). Guide to bumble bees of the eastern United States. United States Department of Agriculture Pollinator Partnership.

Chicago Style (17th ed.) Citation

Colla, Sheila, Leif Richardson, and Paul Williams. Guide to Bumble Bees of the Eastern United States. Washington, D.C.: United States Department of Agriculture Pollinator Partnership, 2011.

MLA (9th ed.) Citation

Colla, Sheila, et al. Guide to Bumble Bees of the Eastern United States. United States Department of Agriculture Pollinator Partnership, 2011.