APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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