Wcislo, William T., Arneson, Laura, Roesch, Kari, Gonzalez, Victor, Smith, Adam M., and Fernandez-Marin, Hermogenes. 2004. "
The Evolution of Nocturnal Behaviour in Sweat Bees, Megalopta Genalis and M. Ecuadoria (Hymenoptera: Halictidae): an Escape From Competitors and Enemies?."
Biological Journal of the Linnean Society. 377–387.