1. Adam B (1983) In search of the best strains of bees. Northern Bee Books, Hebden Bridge
2. Allendorf FW, Luikart G, Aitken SN (2012) Conservation and the genetics of populations, 2nd edn. Wiley-Blackwell, Oxford
3. Alpatov VV (1948) Honeybee species and their use in agriculture. Moscow Society of Naturalists, Moscow
4. Anderson E (1968) Introgressive hybridization. vol ix. Biological research series, vol ix. Hafner Publishing Company, New York
5. Baer B, Schmid-Hempel P (1999) Experimental variation in polyandry affects parasite loads and fitness in a bumble-bee. Nature 397:151–154. https://doi.org/10.1038/16451