Não informado. Extension bulletin. Purdue University, Department of Agricultural Extension.
Chicagoスタイル(17版)引用形式Não informado. Extension Bulletin. Lafayette, Ind: Purdue University, Department of Agricultural Extension.
MLA(8版)引用形式Não informado. Extension Bulletin. Purdue University, Department of Agricultural Extension.
警告: この引用は必ずしも正確ではありません.