1. Butler, C. G. (1959). Queen substance.Bee World 40: 269?275.
2. Butler, C. G. (1960). The significance of queen substance in swarming and supersedure in honey bee (Apis mellifera L.) colonies.Proc. Roy. Entomol. Soc. Lond. A 35: 129?132.
3. Butler, C. G. (1961). The scent of queen honey bees (Apis mellifera) that causes partial inhibition of queen rearing.J. Insect Physiol. 7: 258?264.
4. Butler, C. G., and Callow, R. K. (1968). Pheromones of the honeybee (Apis mellifera L.): The ?inhibitory scent? of the queen.Proc. Roy. Entomol. Soc. Land. A 43: 62?65.
5. Butler, C. G., and Paton, P. N. (1962). Inhibition of queen rearing by queen honey bees (Apis mellifera L.) of different ages.Proc. Roy. Entomol. Soc. Lond. A 37: 114?116.