Não informado. (2021). Farm Economics. Pennsylvannia State University, Cooperative Extension Service.
Chicagoスタイル(17版)引用形式Não informado. Farm Economics. University Park, Pa: Pennsylvannia State University, Cooperative Extension Service, 2021.
MLA(8版)引用形式Não informado. Farm Economics. Pennsylvannia State University, Cooperative Extension Service, 2021.
警告: この引用は必ずしも正確ではありません.