Wells, R. A. (1998). Stretch: Explore, explain, persuade. Prentice Hall.
Chicagoスタイル(17版)引用形式Wells, Randall A. Stretch: Explore, Explain, Persuade. Upper Saddle River, N.J: Prentice Hall, 1998.
MLA(9版)引用形式Wells, Randall A. Stretch: Explore, Explain, Persuade. Prentice Hall, 1998.
警告: この引用は必ずしも正確ではありません.