APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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