Não informado. (2003). Seed technology. Association of Official Seed Analysts.
Lua i Stíl Chicago (17ú heag.)Não informado. Seed Technology. Lincoln, Neb: Association of Official Seed Analysts, 2003.
Lua MLA (8ú heag.)Não informado. Seed Technology. Association of Official Seed Analysts, 2003.
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