Villee, C. A. (1989). Biology (2nd ed.). Philadelphia: Saunders College Pub..
Trích dẫn kiểu ChicagoVillee, Claude Alvin. Biology. 2nd ed. Philadelphia: Saunders College Pub., 1989.
Deismireacht MLAVillee, Claude Alvin. Biology. 2nd ed. Philadelphia: Saunders College Pub., 1989.
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