APA
Brennan C. D., . (2010). Take Your Sales to the Next Level: Advanced Skills to Build Stronger Relationships and Close More Deals. : Mcgraw-hill.
Chicago
Brennan Charles D, . 2010. Take Your Sales to the Next Level: Advanced Skills to Build Stronger Relationships and Close More Deals. : Mcgraw-hill.
Harvard
Brennan C. D., . (2010). Take Your Sales to the Next Level: Advanced Skills to Build Stronger Relationships and Close More Deals. : Mcgraw-hill.
MLA
Brennan Charles D, . Take Your Sales to the Next Level: Advanced Skills to Build Stronger Relationships and Close More Deals. : Mcgraw-hill. 2010.