johnston.mark w. (2008). relationship selling. new york: Mcgraw hill.
Chicago Style Citationjohnston.mark w. Relationship Selling. new york: Mcgraw hill, 2008.
Cita MLAjohnston.mark w. Relationship Selling. new york: Mcgraw hill, 2008.
Atenció: Aquestes cites poden no estar 100% correctes.