Shock, C.C.; Ishida, J.; Feibert, E.B.G.; Shaw, N.L. 2010. Native perennial forb tolerance to repeated annual applications of postemergence herbicides. Corvallis, OR: Oregon State University, Malheur Experiment Station. Annual Report 2009. Ext/CrS 131: 213-217.
Shock, C.C.; Ishida, J.; Feibert, E.B.G.; Shaw, N.L. 2009. Native perennial forb tolerance to repeated annual applications of postemergence herbicides. Special Report 1094. Corvallis, OR: Oregon State University, Malheur Experiment Station: 180-184.
Shock, C.C.; Feibert, E.B.G.; Shaw, N.L. 2009. Native perennial forb tolerance to rates and mixtures of postemergence herbicides. Special Report 1094. Corvallis, OR: Oregon State University, Malheur Experiment Station: 177-179.
Native wildflowers grown for seed production show tolerance to conventional postemergence herbicides
Shock, C.C.; Ishida, J.; Feibert, E.B.G. 2008. Native wildflowers grown for seed production show tolerance to conventional postemergence herbicides. Special Report 1087. Corvallis, OR: Oregon State University, Malheur Experiment Station: 197-203.
Shock, C.C.; Ishida, J.; Ransom, C. 2007. Tolerance of seven native forbs to preemergence and postemergence herbicides. Special Report 1075. Ontario, OR: Oregon State University Malheur Experiment Station: 21-32.
Shock, C.C.; Ishida, J.K.; Ransom, C.V. 2006. Identification of herbicides for use in native forb seed production. Special Report 1070. Corvallis, OR: Oregon State University, Malheur Experiment Station: 35-38.
Shock, C.C.; Feibert, E.B.G.; Saunders, L.D. 2006. Subsurface drip irrigation for native forb seed production. Special Report 1070Corvallis, OR: Oregon State University, Malheur Experiment Station: 39-41.
Shock, C.C.; Ishida, J.K.; Ransom, C.V. 2006. Identification of herbicides for use in native forb seed production. Special Report 1070. Corvallis, OR: Oregon State University, Malheur Experiment Station: 35-38.
Colorado State University, Extension. Native plant seed production. 2010-Present. Fort Collins, CO: Colorado State University Extension. Available: http://wci.colostate.edu/seed_production.shtml
Tilley, Derek J. 2015. Seed production and field establishment of hoary tansyaster (Machaeranthera canescens). Native Plants Journal. 16(1): 61-66.