Asan Zheldibayev, Yerkin Nessipbekov, Almaz Belgibayev, Zhanat Belgibayeva, и Gulmira Appakova. «THE ROLE OF MARKETING RESEARCH IN IMPROVING THE EFFICIENCY OF HOTEL ENTERPRISES IN KAZAKHSTAN». «Доклады НАН РК», вып. 2, апрель 2020 г., сс. 139-44, http://189185.vm7pq.group/reports-science/article/view/804.