Cita APA (7a ed.)

FREEMANTLE, D. (1992). Incredible Customer Service. McGraw-Hill.

Cita Chicago Style (17a ed.)

FREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.

Cita MLA (8a ed.)

FREEMANTLE, David. Incredible Customer Service. McGraw-Hill, 1992.