APA aipamena

Sewell, C. (2002). Customers for Life (1st.). Crown Business.

Chicago Style aipamena

Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.

MLA aipamena

Sewell, Carl. Customers for Life. 1st. Crown Business, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.