Não informado. Extension bulletin. Purdue University, Department of Agricultural Extension.
Style de citation Chicago (17e éd.)Não informado. Extension Bulletin. Lafayette, Ind: Purdue University, Department of Agricultural Extension.
Style de citation MLA (8e éd.)Não informado. Extension Bulletin. Purdue University, Department of Agricultural Extension.
Attention : ces citations peuvent ne pas être correctes à 100%.