Asan Zheldibayev, Yerkin Nessipbekov, Almaz Belgibayev, Zhanat Belgibayeva и Gulmira Appakova (2020) «THE ROLE OF MARKETING RESEARCH IN IMPROVING THE EFFICIENCY OF HOTEL ENTERPRISES IN KAZAKHSTAN», Academic Journal of Physical and Chemical Sciences, (2), сс. 139–144. доступно на: https://journals.nauka-nanrk.kz/reports-science/article/view/804 (просмотрено: 5 декабрь 2025).