APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.