Fewell, Jennifer H.; Susan M. Bertram (2002). "Evidence for genetic variation in worker task performance by African and European honeybees". Behavioral Ecology and Sociobiology. 52 (4): 318–25. Bibcode:2002BEcoS..52..318F. doi:10.1007/s00265-002-0501-3. S2CID22128779.
Fewell, Jennifer H.; Susan M. Bertram (2002). "Evidence for genetic variation in worker task performance by African and European honeybees". Behavioral Ecology and Sociobiology. 52 (4): 318–25. Bibcode:2002BEcoS..52..318F. doi:10.1007/s00265-002-0501-3. S2CID22128779.
Fewell, Jennifer H.; Susan M. Bertram (2002). "Evidence for genetic variation in worker task performance by African and European honeybees". Behavioral Ecology and Sociobiology. 52 (4): 318–25. Bibcode:2002BEcoS..52..318F. doi:10.1007/s00265-002-0501-3. S2CID22128779.