APA (7th ed.) Citation

Grougiou, V., Pettigrew, S., & Unknown. (2009). Senior Customers' Service Encounter Preferences. Unknown.

Chicago Style (17th ed.) Citation

Grougiou, V., Simone Pettigrew, and Unknown. Senior Customers' Service Encounter Preferences. Unknown, 2009.

MLA (9th ed.) Citation

Grougiou, V., et al. Senior Customers' Service Encounter Preferences. Unknown, 2009.