Tohutoro APA (7th ed.)

Williams, P. H. (2014). Bumble bees of North America: An identification guide. Princeton University Press.

Tohutoru Kātū Chicago (17th ed.)

Williams, Paul H. Bumble Bees of North America: An Identification Guide. Princeton, New Jersey ; Oxfordshire, England: Princeton University Press, 2014.

Tohutoro MLA (9th ed.)

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