APA-Zitierstil (7. Ausg.)

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

Chicago-Zitierstil (17. Ausg.)

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

MLA-Zitierstil (9. Ausg.)

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