Roberts, I. P. (1911). Fertility of the Land (12.). Macmillan Company.
シカゴスタイル引用形Roberts, Issac Phillip. Fertility of the Land. 12. New York: Macmillan Company, 1911.
MLA引用形式Roberts, Issac Phillip. Fertility of the Land. 12. Macmillan Company, 1911.
警告: この引用は必ずしも正確ではありません.