Reference page
http://data.worldbank.org/indicator/ST.INT.ARVL?name_desc=true
http://data.worldbank.org/indicator/ST.INT.ARVL?name_desc=true
https://travel.state.gov/content/passports/en/country/spain.html
https://www.minnpost.com/cityscape/2016/01/psychology-light-rail-safety
http://archive.azcentral.com/news/articles/2009/07/03/20090703railatnight-side0703.html#ixzz4QKAPFB38
http://www.statepress.com/article/2015/10/student-light-rail-safety
staff at phoenix buisniss journal , 2015
the bresolo lawfirm,ND
https://my.clevelandclinic.org/health/articles/adolescent-social-development
https://www.sciencedaily.com/releases/2016/08/160824135308.htm
http://www.understandingchildhood.net/posts/supporting-teenagers/
http://www.coramvoice.org.uk/young-peoples-zone/faq/cin/i-dont-feel-safe-home-what-should-i-do
http://www.cbs5az.com/story/18306315/light-rail-crashes-more-common-in-downtown-phoenix-tempe
http://www.metro-magazine.com/government-issues/news/295193/phoenix-voters-approve-sales-tax-increase-to-fund-transportation
http://kjzz.org/content/311187/not-everyone-all-aboard-final-light-rail-route-planned-downtown-glendale
http://www.progressiveengineer.com/features/lightRail.htm