Cita APA (7th ed.)

Portnoy, R. A. (1999). Leadership: 4 competencies for success. Prentice Hall.

Cita Chicago (17th ed.)

Portnoy, Robert A. Leadership: 4 Competencies for Success. Upper Saddle River, N.J: Prentice Hall, 1999.

Cita MLA (9th ed.)

Portnoy, Robert A. Leadership: 4 Competencies for Success. Prentice Hall, 1999.