(2013). Summary of Hopkins' How to Master the Art of Selling. Business Book Summaries.
Style de citation Chicago (17e éd.)Summary of Hopkins' How to Master the Art of Selling. Bruxelles: Business Book Summaries, 2013.
Style de citation MLA (8e éd.)Summary of Hopkins' How to Master the Art of Selling. Business Book Summaries, 2013.
警告：這些引文格式不一定是100％准確.