1. Collection of Tourism Expenditure Statistics. World Tourism Organization. p. 1 Ch Available at: https://web.archive.org/web/20100922120940/http://pub.unwto.org/WebRoot/Store/Shops/Infoshop/Products/1034/1034-1.pdf (accessed 16.07.2018).
2. Ch. R. Goeldner, J. R. Brent R Itchie. Tourism. Principles, Practices, Philosophies. Twelfth Edition. Hoboken: John Wiley & Sons, Inc., 2012, p. 3.
3. Cohen E. The Sociology of Tourism: Approaches, Issues, and Findings. Ch Annual Review of Sociology, 1984, є 10, p. 374-376.
4. UNWTO Annual Report 2017, p. 2. Ch Available at: https://www.e-unwto.org/doi/book/10.18111/9789284419029 (accessed 15.06.2018).
5. UNWTO Highlights. 2017 Edition, p. 3. Ch Available at: https://www.e-unwto.org/doi/book/10.18111/9789284419029 (accessed 8.06.2018).
6. Ibid., p. 6.
7. Ibid., p. 4.
8. Ibid., p. 3 .
9. Ibid., p. 2.
10. Global tourism. Edited by W.F. Theobald. Third Edition. Burlington: Elsevier Inc., 2005, p. 1.
11. UNWTO Annual Report 2017, p. 6. Ch Available at: https://www.e-unwto.org/doi/book/10.18111/9789284419029 (accessed 15.06.2018).
12. UNWTO Highlights, 2017, Edition, p. 4. Ch Available at: https://www.e-unwto.org/doi/book/10.18111/9789284419029 (accessed 10.06.2018).
13. Ibid., p. 10.
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