Chapter 1
1. Falchi, et al. (2016).
2. Wall (2017).
Chapter 2
1. Marquès (2020).
2. Machando (2014), www.grammarist.com/usage/connect-the-dots-and-jointhe-dots (accessed September 24, 2020).
3. Anderberg (2019).
Chapter 3
1. Dann (1981).
2. Hill (2019).
3. Source: statistica.com.
4. Lowrey (2019).
5. Airbnb.com (2018).
6. Williams (1988).
7. Mitchell and Gallaway (2019).
8. Hunter and Crawford (1991).
9. Mitchell and Gallaway (2019), p. 27.
Chapter 4
1. https://advances.sciencemag.org/content/2/6/e1600377
2. https://globalnews.booking.com/reveals key findings from its 2019 sustainable travel report/retrieved 2-8-2020.
3. ICAO.
4. (Sumers 2019).
5. https://britannica.com/biography/Thomas-Hiram-Holding
6. (Holding 1908).
7. (Simkins 2020). ...
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