Cita APA (7th ed.)
Langford, B. Y. (2005). The etiquette edge: The unspoken rules for business success. AMACOM.
Cita Chicago (17th ed.)
Langford, Beverly Y. The Etiquette Edge: The Unspoken Rules for Business Success. New York: AMACOM, 2005.
Cita MLA (9th ed.)
Langford, Beverly Y. The Etiquette Edge: The Unspoken Rules for Business Success. AMACOM, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.