@inbook{inbook372b03df,
title   = {Caste development, reproductive strategies and control of fertility in honey bees and stingless bees},
author = {Engels, W and Imperatriz-Fonseca, Vera Lucia},
year = {1990},
publisher = {Springer-Verlag},
journal   = {Social Insects, an Evolutionary Approach To Castes and Reproduction}
}