Altmann, G. and Aleksanyan, G. (2016) “SUSTAINABILITY IN TOURISM: PROBLEMS AND SOME BASIC DIRECTIONS OF SUSTAINABLE TOURISM MANAGEMENT”, Proceedings of the YSU C: Geological and Geographical Sciences. Yerevan, Armenia, 50(2 (240), pp. 59–67. doi: 10.46991/PYSU:C/2016.50.2.059.