Orr, R. T. (1976). Vertebrate biology (4th ed.). Saunders.
Chicago Edition CitationOrr, Robert T. Vertebrate Biology. 4th ed. Philadelphia: Saunders, 1976.
MLA Edition CitationOrr, Robert T. Vertebrate Biology. 4th ed. Saunders, 1976.
Warning: These citations may not always be 100% accurate.