APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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