Não informado. (1889). Farmers Bulletin. U.S. Department of Agriculture.
Chicagoスタイル(17版)引用形式Não informado. Farmers Bulletin. Washington: U.S. Department of Agriculture, 1889.
MLA(8版)引用形式Não informado. Farmers Bulletin. U.S. Department of Agriculture, 1889.
警告: この引用は必ずしも正確ではありません.