11. Tourism: principles, practices, philosophies Goeldner, Charles R. Hoboken, NJ : John Wiley & Sons, c2012. GEB119
12. Visit sunny Chernobyl: and other adventures in the world's most polluted places Blackwell, Andrew, 1972- London : Random House, 2012. GEB119
13. The ethics of sightseeing MacCannell, Dean. Berkeley, CA : University of California Press, c2011. ENG389
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