Παραπομπή APA

Singh, R. (2011). Tourism sector: Facing the challenge. Sonali.

Παραπομπή Chicago Style

Singh, Rajesh. Tourism Sector: Facing the Challenge. New Delhi: Sonali, 2011.

Παραπομπή MLA

Singh, Rajesh. Tourism Sector: Facing the Challenge. Sonali, 2011.