Não informado. (1946). Extension service news. Virginia Polytechnic Institute, Agricultural Extension Service.
Čikaški stil citiranja (17. izdanje)Não informado. Extension Service News. Blacksburg, Va: Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
MLA način citiranja (8. izdanje)Não informado. Extension Service News. Virginia Polytechnic Institute, Agricultural Extension Service, 1946.
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