Ayres, F. (1954). Theory & problems of Trigonemetry. Schaum Pub. Co.
芝加哥风格引文Ayres, Frank. Theory & Problems of Trigonemetry. New York: Schaum Pub. Co, 1954.
MLA引文Ayres, Frank. Theory & Problems of Trigonemetry. Schaum Pub. Co, 1954.
警告：这些引文格式不一定是100％准确.