Cita APA (7th ed.)

Zartman, W., & Berman, M. The Practical negotiator. New Haven and London.

Cita Chicago (17th ed.)

Zartman, William, i Maureen Berman. The Practical Negotiator. Massachussetts: New Haven and London.

Cita MLA (9th ed.)

Zartman, William, i Maureen Berman. The Practical Negotiator. New Haven and London.