Sobel, A. (2013). Power questions to win the sale: Overcoming nine critical sales challenges. Wiley.
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Chicago-čujuhus (17. p.)
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Hoboken, N.J.: Wiley, 2013.
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MLA-čujuhus (9. p.)
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Wiley, 2013.
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