Citazione Stile APA (7a Edizione)

Werz, E. W. (1993). The complete customer service letter book. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Werz, Edward W. The Complete Customer Service Letter Book. New York: McGraw-Hill, 1993.

Citatione MLA (9a ed.)

Werz, Edward W. The Complete Customer Service Letter Book. McGraw-Hill, 1993.