Helms, C. R. (1917). Agricultural credits in the United States.
Chicagoスタイル(17版)引用形式Helms, Connie Ray. Agricultural Credits in the United States. 1917.
MLA(8版)引用形式Helms, Connie Ray. Agricultural Credits in the United States. 1917.
警告: この引用は必ずしも正確ではありません.