APA-viite (7. p.)

Gupta, S. (2008). Managing customers as investments. Pearson Power.

Chicago-viite (17. p.)

Gupta, Sunil. Managing Customers as Investments. New Delhi: Pearson Power, 2008.

MLA-viite (9. p.)

Gupta, Sunil. Managing Customers as Investments. Pearson Power, 2008.