Sawyer, W. W. (1959). A concrete approach to abstract algebra. W. H. Freeman.
芝加哥风格引文Sawyer, W. W. A Concrete Approach to Abstract Algebra. San Francisco: W. H. Freeman, 1959.
MLA引文Sawyer, W. W. A Concrete Approach to Abstract Algebra. W. H. Freeman, 1959.
警告：这些引文格式不一定是100％准确.