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| 1. |
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Tourism and Innovation

Michael C Hall, Allan M Williams
Inbunden. Routledge, Storbritannien, 2008.
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| 2. |
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A Companion to Tourism

C Michael Hall, Alan A Lew, Allan M Williams
Inbunden. Blackwell Publishing Ltd, Storbritannien, 2004.
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| 3. |
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Companion to Tourism

Alan Lew, C Michael Hall, Allan M Williams
E-bok. John Wiley & Sons, USA, 2008.
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