Mıllıron, H. E., & editor: Vickery, V. R. (1973). A Monograph of the Western Hemisphere Bumblebees (hymenoptera: apidae: bombinae): III. The genus pyrobombus subgenus cullumanobombus. Ottowa: The Entomological Society of Canada.
Chicago Style CitationMıllıron, H. E., and V. R. editor: Vickery. A Monograph of the Western Hemisphere Bumblebees (hymenoptera: Apidae: Bombinae): III. The Genus Pyrobombus Subgenus Cullumanobombus. Ottowa: The Entomological Society of Canada, 1973.
MLA CitationMıllıron, H. E., and V. R. editor: Vickery. A Monograph of the Western Hemisphere Bumblebees (hymenoptera: Apidae: Bombinae): III. The Genus Pyrobombus Subgenus Cullumanobombus. Ottowa: The Entomological Society of Canada, 1973.
Warning: These citations may not always be 100% accurate.