Nageh S.M. Omran m.fl.: Predators of Honeybee and its Impact on Activities of Honeybee Colonies under Conditions of South Valley, Egypt, Research Journal of Agriculture and Biological Sciences, 7(1): 79-88, 2011, ISSN 1816-1561; http://www.aensiweb.com/rjabs/rjabs/2011/79-88.pdf[død lenke]