APA-čujuhus (7. p.)

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

Chicago-čujuhus (17. p.)

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

MLA-čujuhus (9. p.)

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

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