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Lua i Stíl Chicago (17ú heag.)Cerina, Fabio, Anil Markandya, agus Michael McAleer. Economics of Sustainable Tourism. Abingdon, Oxon: Routledge, 2011.
Lua MLA (9ú heag.)Cerina, Fabio, et al. Economics of Sustainable Tourism. Routledge, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.