Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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