Cita APA (7th ed.)

KATZ BERNARD. (1985). HOW TO TURN CUSTOMER SERVICE INTO CUSTOMER SALES (2.). NTC BUSINESS BOOKS.

Cita Chicago (17th ed.)

KATZ BERNARD. HOW TO TURN CUSTOMER SERVICE INTO CUSTOMER SALES. 2. USA: NTC BUSINESS BOOKS, 1985.

Cita MLA (9th ed.)

KATZ BERNARD. HOW TO TURN CUSTOMER SERVICE INTO CUSTOMER SALES. 2. NTC BUSINESS BOOKS, 1985.