Williams, P. H. (2014). Bumble bees of North America: An identification guide. Princeton University Press.
芝加哥风格引文Williams, Paul H. Bumble Bees of North America: An Identification Guide. Princeton, New Jersey ; Oxfordshire, England: Princeton University Press, 2014.
MLA引文Williams, Paul H. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014.
警告：这些引文格式不一定是100％准确.