Não informado. (1920). Station circular. Oregon Agricultural Experiment Station.
Chicagoスタイル(17版)引用形式Não informado. Station Circular. Corvallis, Ore: Oregon Agricultural Experiment Station, 1920.
MLA(8版)引用形式Não informado. Station Circular. Oregon Agricultural Experiment Station, 1920.
警告: この引用は必ずしも正確ではありません.