Bee Alert: On the use of bees for environmental hazard detection. From Montana University.
Honeybee Biology: A very nicely illustrated account of the biology of Apis mellifera.
Honeybees of the Genus Apis: Descriptions of the common species, with more detailed accounts of the giant and dwarf honeybees, Apis dorsata and Apis florea.
Queen Honey Bee Pheromone Research: Research by Christopher Keeling on elucidating a second queen honey bee pheromone that, along with the queen mandibular pheromone, the queen uses to control her colony.