Llewellyn, R. S. (2002). Contracting for Agricultural Extension: International Case Studies and Emerging Practices [Book Review]. Australian Journal of Agricultural and Resource Economics. 47, 144-146.
Llewellyn, R. S., Lindner, R. K., Pannell, D. J., and Powles, S. B. (2002). Resistance and the herbicide resource: perceptions of Western Australian grain growers. Crop Protection 21, 1067-1075.
Preston, C. and Powles, S.B. (2002) Evolution of herbicide resistance in weeds: Initial frequency of target site-based resistance to acetolactate synthase-inhibiting herbicides in Lolium rigidum. Heredity, 88, 8-13.
Reiger, M.A., Lamond, M., Preston, C., Powles, S.B., and Roush, R.T. (2002) Pollen-mediated movement of herbicide resistance between commercial canola fields. Science, 296 (5577), 2386-2388.