Não informado. Extension Folder. North Carolina State College of Agriculture and Engineering, Agricultural Extension Service.
Čikaški stil citiranja (17. izdanje)Não informado. Extension Folder. Raleigh, NC: North Carolina State College of Agriculture and Engineering, Agricultural Extension Service.
MLA način citiranja (8. izdanje)Não informado. Extension Folder. North Carolina State College of Agriculture and Engineering, Agricultural Extension Service.
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