https://www.google.com/url?rct=j&sa=t&url=http://www.out-law.com/en/articles/2015/may/amazon-begins-to-book-revenues-in-separate-countries-in-what-expert-says-is-response-to-regulatory-pressure/&ct=ga&cd=CAIyGmJjNGEwZWQ4N2QyMGU3Nzg6Y29tOmVuOlVT&usg=AFQjCNGEalGy0ZScI2eOuOf-oxSJuBlT8g