Cita APA (7th ed.)

Zeithaml Valari. (2013). Services Marketing (6th.). McGraw Hill.

Cita Chicago (17th ed.)

Zeithaml Valari. Services Marketing. 6th. New Delhi: McGraw Hill, 2013.

Cita MLA (9th ed.)

Zeithaml Valari. Services Marketing. 6th. McGraw Hill, 2013.