B. J.  Sampson, Cane, J. H., Kirker, G. T., Stringer, S. J., and Spiers, J. M., ?Biology and management potential for three orchard bee species (Hymenoptera: Megachilidae): Osmia ribifloris Cockerell, O. lignaria (Say) and O. chalybea Smith, with emphasis on the former?, vol. 810, pp. 549 - 556, 2009.