Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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