Peters, John M., Queller, David C., Imperatriz-Fonseca, Vera L., Roubik, David Ward, and Strassmann, Joan E. 1999. "
Mate Number, Kin Selection and Social Conflicts in Stingless Bees and Honeybees."
Proceedings of the Royal Society B: Biological Sciences, 266, (1417) 379–384.