Não informado. (1887). Bulletin of the Pennsylvania Agricultural Experiment Station. Pennsylvania Agricultural Experiment Station.
Chicagoスタイル(17版)引用形式Não informado. Bulletin of the Pennsylvania Agricultural Experiment Station. Harrisburg, Pa: Pennsylvania Agricultural Experiment Station, 1887.
MLA(8版)引用形式Não informado. Bulletin of the Pennsylvania Agricultural Experiment Station. Pennsylvania Agricultural Experiment Station, 1887.
警告: この引用は必ずしも正確ではありません.