APA (7th ed.) Citation

Williams, P., Thorp, R. W., Richardson, L., & Colla, S. (2014). Bumble bees of North America: An identification guide. Princeton University Press.

Chicago Style (17th ed.) Citation

Williams, Paul, Robbin W. Thorp, Leif Richardson, and Sheila Colla. Bumble Bees of North America: An Identification Guide. Princeton: Princeton University Press, 2014.

MLA (8th ed.) Citation

Williams, Paul, et al. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014.