(2014). Summary: Jeffrey Gitomer's 21.5 Unbreakable Laws of Selling : Review and Analysis of Gitomer's Book. Business Book Summaries.
Style de citation Chicago (17e éd.)Summary: Jeffrey Gitomer's 21.5 Unbreakable Laws of Selling : Review and Analysis of Gitomer's Book. Bruxelles: Business Book Summaries, 2014.
Style de citation MLA (8e éd.)Summary: Jeffrey Gitomer's 21.5 Unbreakable Laws of Selling : Review and Analysis of Gitomer's Book. Business Book Summaries, 2014.
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