Sobel, M. A., & Lerner, N. (1991). Algebra and trigonometry (4th ed.). Prentice hall.
芝加哥风格引文Sobel, Max A., 与 Norbert Lerner. Algebra and Trigonometry. 4th ed. Englewood cliffs: Prentice hall, 1991.
MLA引文Sobel, Max A., 与 Norbert Lerner. Algebra and Trigonometry. 4th ed. Prentice hall, 1991.
警告：这些引文格式不一定是100％准确.