APA (7th ed.) Zitazioa
Sobel, A. (2013). Power questions to win the sale: Overcoming nine critical sales challenges. Wiley.
Chicago Style (17th ed.) Zitazioa
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Hoboken, N.J.: Wiley, 2013.
MLA (9th ed.) Zitazioa
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Wiley, 2013.
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