1. R. S. Currie, and C. R. Thompson .1999 .Herbicide timing for woollyleaf bursage control., Proc. West. Soc. Weed Sci, 52 :112 .
2. W. Donald, 1990 .Management and control of Canada thistle., Rev. Weed Sci, 5 :193 –249 .
3. J. D. Everitt, J. W. Keeling, P. A. Dotray, and T. S. Osborne .1999 .Roundup ready and BXN systems for perennial weed control on the Texas Southern High Plains., Proc. South. Weed Sci. Soc, 52 :239 .
4. J. W. Keeling, and J. R. Abernathy .1988 .Woollyleaf bursage (Ambrosia grayi) and Texas blueweed (Helianthus ciliaris)., Weed Technol, 2 :12 –15 .
5. T. Sheikh, P. A. Dotray, T. A. Wheeler, and J. C. Zak .1999 .Control of woollyleaf bursage withPseudomanas syringae., Proc. West. Soc. Weed Sci, 52 :18 –19 .