APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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