Singh, R. (1996). Service: Heart of hospitality. Shipra.
Cita Chicago (17th ed.)Singh, R. Service: Heart of Hospitality. Delhi: Shipra, 1996.
Cita MLA (9th ed.)Singh, R. Service: Heart of Hospitality. Shipra, 1996.
Atenció: Aquestes cites poden no estar 100% correctes.