The mandatory classification of hotels and other types of accommodation as a business process: the case of the Kaliningrad region
... список обязательных мест для посещения в России. URL:
https://www.newkaliningrad.ru/news/briefs/community/8345888-the-guardian-vklyuchil-kaliningrad-v-spi...
(дата обращения: 30.04.2016).
Nikiforova I., Semenchuk N.
mandatory classification, hospitality industry, accommodation, business process
104-111