1. Bodenheimer, F. S. (1937) Studies in animal population. II. Seasonal population trends of the honey bee.Quart. Rev. Biol. 12: 406–425.
2. Brian, A. D. (1951) Brood development inBombus agrorum.Ent. Mon. Mag. 87: 207–212.
3. Brian, M. V. (1965)Social insect populations. viii+135pp. Academic Press, London and New York.
4. Fukuda, H. andK. Sekiguchi (1966) Seasonal change of the honeybee worker longevity in Sapporo, North Japan, with notes on some factors affecting the life-span.Jap. J. Ecol. 16: 206–212.
5. Hachinoe, Y. andM. Jimbu (1958) Occurrence of the lethal eggs in the honeybee.Bull. Nat. Inst. Agric. Sci. Ser. G (Animal Husbandry) 14: 123–130 (In Japanese with English summary).