Ziglar, Z. (2011). Better than Good. Jaico.
Cita Chicago (17th ed.)Ziglar, Zig. Better than Good. Jaico, 2011.
Cita MLA (9th ed.)Ziglar, Zig. Better than Good. Jaico, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)