沃尔克普 & 麦基. (2009). 用电话向所有人销售: Selling to anyone over the phone. 黑龙江科学技术出版社.
Chicago Style (17th ed.) Citation沃尔克普 and 麦基. 用电话向所有人销售: Selling to Anyone over the Phone. 黑龙江科学技术出版社, 2009.
MLA citiranje沃尔克普 and 麦基. 用电话向所有人销售: Selling to Anyone over the Phone. 黑龙江科学技术出版社, 2009.
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