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Saarbrücken: VDM Verlag Dr. Müller, 2007
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1995
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Lohmar; Köln: Eul, 2002
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Publication Server of CAMPUS 02 University of Applied Sciences, 2023
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Luxembourg: Publications Office, July 2020
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Essen: MA Akademie Verlags- und Druck-Gesellschaft mbH, 2022
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Unterhaching: [Verband Internet Reisevertrieb], [2009]- / 4 (2009)-
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[Wayne, PA]: Tourism Economics, [2022]