Powers, L. E. (1999). Ecological principles of agriculture. Africa: Delmar / Thomson Learning.
Trích dẫn kiểu ChicagoPowers, Laura E. Ecological Principles of Agriculture. Africa: Delmar / Thomson Learning, 1999.
ציטוט MLAPowers, Laura E. Ecological Principles of Agriculture. Africa: Delmar / Thomson Learning, 1999.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.