Coelho, Joseph R.; Hastings, Jon M.; et al. (January 2008). "Sexual Dimorphism of the Femora, Tibiae, and Hind Tibial Spurs in the Eastern Cicada Killer, Sphecius speciosus Drury (Hymenoptera: Crabronidae) in the United States". Entomological News. 119 (1): 11–18. doi:10.3157/0013-872X(2008)119[11:SDOTFT]2.0.CO;2. S2CID86426837.
Coelho, Joseph R.; Hastings, Jon M.; et al. (January 2008). "Sexual Dimorphism of the Femora, Tibiae, and Hind Tibial Spurs in the Eastern Cicada Killer, Sphecius speciosus Drury (Hymenoptera: Crabronidae) in the United States". Entomological News. 119 (1): 11–18. doi:10.3157/0013-872X(2008)119[11:SDOTFT]2.0.CO;2. S2CID86426837.