Linton, I. (1997). 30 minutes - to write sales letters. Kogan Page.
Chicagoスタイル(17版)引用形式Linton, Ian. 30 Minutes - to Write Sales Letters. New Delhi: Kogan Page, 1997.
MLA(8版)引用形式Linton, Ian. 30 Minutes - to Write Sales Letters. Kogan Page, 1997.
警告: この引用は必ずしも正確ではありません.