«ABNT NBR 15713:2009». ABNT NBR 15713:2009 Apicultura - Equipamentos - Colmeia tipo Langstroth. ABNT. 2 de junho de 2009. Consultado em 28 de junho de 2016
Huber, François New Observations on the Natural History of Bees, 1806. (English translation as published) Retrieved from transcribed copy at [1], 21 November 2011; scanned copy also available at [2] as of 21 November 2011.
cornell.edu
bees.library.cornell.edu
Huber, François New Observations on the Natural History of Bees, 1806. (English translation as published) Retrieved from transcribed copy at [1], 21 November 2011; scanned copy also available at [2] as of 21 November 2011.
