Sewell, C. (2002). Customers for Life (1st.). Crown Business.
Chicagoスタイル(17版)引用形式Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.
MLA(9版)引用形式Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.
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APA(7版)引用形式