Schroeder, Kent (2017). «The Last Shangri-La?». Politics of Gross National Happiness: Governance and Development in Bhutan. Cham (Zug): Springer. էջ 55. ISBN9783319653884. Վերցված է 2020 թ․ հունվարի 25-ին. «To drive increased tourism revenues, the earlier approach of 'high value, low volume' was replaced by 'high value, low impact'. This represented a subtle but significant shift.»