Williams, P., Thorp, R. W., Richardson, L., & Colla, S. (2014). Bumble bees of North America: An identification guide. Princeton University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Paul, Robbin W. Thorp, Leif Richardson, और Sheila Colla. Bumble Bees of North America: An Identification Guide. Princeton, New Jersey: Princeton University Press, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Paul, et al. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014.
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