1. Ad hoc Subcommittee of the Agricultural Research Policy Advisory Committee (1973). “Recommended Actions and Policies for Minimizing the Genetic Vulnerability of our Major Crops.” A Special Report, Agricultural Research Policy Advisory Committee, The USDA and the Nat. Assoc. State Univs. and Land Grant Colleges Cooperating, Washington, D. C.
2. Agricultural Research Service (1977). “The National Plant Germplasm System.” Program Aid Number 1188, USDA, Washington, D. C.
3. Genetic systems associated with colonizing ability in predominantly self-pollinating species;Allard,1965
4. The genetics of inbreeding species;Allard;Advan. Genet.,1968
5. Commentary;Baker,1971