Citazione APA

Kranz, R., & Kranz, M. (1980). Professional selling, a practical approach. Van Nostrand.

Stile di citazione Chicago

Kranz, R.J, e M.K Kranz. Professional Selling, a Practical Approach. New York: Van Nostrand, 1980.

Citazione MLA

Kranz, R.J, e M.K Kranz. Professional Selling, a Practical Approach. Van Nostrand, 1980.