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», ДНР, вып. 2, сс. 139–144, апр. 2020.