ZEISS, T. (2000). NINE ESSENTIAL LAWS FOR BECOMING INFLUENTIAL.
Cita Chicago (17th ed.)ZEISS, TONY. NINE ESSENTIAL LAWS FOR BECOMING INFLUENTIAL. 2000.
Cita MLA (9th ed.)ZEISS, TONY. NINE ESSENTIAL LAWS FOR BECOMING INFLUENTIAL. 2000.
Atenció: Aquestes cites poden no estar 100% correctes.