Ziglar, Z. (2003). Selling 101.
Cita Chicago (17th ed.)Ziglar, Zig. Selling 101. Mumbai, 2003.
Cita MLA (9th ed.)Ziglar, Zig. Selling 101. 2003.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)
Ziglar, Z. (2003). Selling 101.
Cita Chicago (17th ed.)Ziglar, Zig. Selling 101. Mumbai, 2003.
Cita MLA (9th ed.)Ziglar, Zig. Selling 101. 2003.