Cita APA (7a ed.)

Greenberg, J., & Greenberg, H. M. (1990). What it takes to succeed in sales: Selecting and retaining top producers. Business One Irwin.

Cita Chicago Style (17a ed.)

Greenberg, Jeanne, y Herbert M. Greenberg. What It Takes to Succeed in Sales: Selecting and Retaining Top Producers. Homewood: Business One Irwin, 1990.

Cita MLA (9a ed.)

Greenberg, Jeanne, y Herbert M. Greenberg. What It Takes to Succeed in Sales: Selecting and Retaining Top Producers. Business One Irwin, 1990.