Wells, R. A. (1998). Stretch: Explore, explain, persuade. Prentice Hall.
芝加哥风格引文Wells, Randall A. Stretch: Explore, Explain, Persuade. Upper Saddle River, N.J: Prentice Hall, 1998.
MLA引文Wells, Randall A. Stretch: Explore, Explain, Persuade. Prentice Hall, 1998.
警告：这些引文格式不一定是100％准确.