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Lua i Stíl Chicago (17ú heag.)Singh, Sagar. Studies in Tourism: Key Issues for Effective Management. New Delhi: A P H, 1999.
Lua MLA (9ú heag.)Singh, Sagar. Studies in Tourism: Key Issues for Effective Management. A P H, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.