एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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