APA (7e ed.) Bronvermelding
Sobel, A. (2013). Power questions to win the sale: Overcoming nine critical sales challenges. Wiley.
Chicago (17e ed.) Bronvermelding
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Hoboken, N.J.: Wiley, 2013.
MLA (9e ed.) Bronvermelding
Sobel, Andrew. Power Questions to Win the Sale: Overcoming Nine Critical Sales Challenges. Wiley, 2013.
Let op: Deze citaties zijn niet altijd 100% accuraat.