APA引用形式

Powers, L. E. (1999). Ecological principles of agriculture. Africa: Delmar / Thomson Learning.

シカゴスタイル引用形

Powers, Laura E. Ecological Principles of Agriculture. Africa: Delmar / Thomson Learning, 1999.

MLA引用形式

Powers, Laura E. Ecological Principles of Agriculture. Africa: Delmar / Thomson Learning, 1999.

警告: この引用は必ずしも正確ではありません.