Williams, P. H. (2014). Bumble bees of North America: An identification guide. Princeton University Press.
Chicagoスタイル(17版)引用形式Williams, Paul H. Bumble Bees of North America: An Identification Guide. Princeton, New Jersey ; Oxfordshire, England: Princeton University Press, 2014.
MLA(9版)引用形式Williams, Paul H. Bumble Bees of North America: An Identification Guide. Princeton University Press, 2014.
警告: この引用は必ずしも正確ではありません.