J. H.  Cane and Schiffhauer, D., ?Pollinator genetics and pollination: do honey bee colonies selected for pollen-hoarding field better pollinators of cranberry Vaccinium macrocarpon??, Ecological Entomology, vol. 26, pp. 117 - 123, 2001.

N. M.  Williams and Thomson, J. D., ?Comparing pollinator quality of honey bees (Hymenoptera: Apidae) and native bees using pollen removal and deposition measures?, in For non-native crops, whence pollinators of the future?, K.  Strickler and Cane, J. H., Eds. Lanham, Maryland: Entomol. Soc. Amer., 2003, pp. 163 - 180.