Cita APA (7a ed.)

Tracy, B., & Tracy, B. C. (2013). The Psychology of Selling: Increase Your Sales Faster and Easier Than You Ever Thought Possible (Unabridged.). Your Coach Digital.

Cita Chicago Style (17a ed.)

Tracy, Brian, y Brian Contributor Tracy. The Psychology of Selling: Increase Your Sales Faster and Easier Than You Ever Thought Possible. Unabridged. Rego Park: Your Coach Digital, 2013.

Cita MLA (9a ed.)

Tracy, Brian, y Brian Contributor Tracy. The Psychology of Selling: Increase Your Sales Faster and Easier Than You Ever Thought Possible. Unabridged. Your Coach Digital, 2013.