N. A. Gerasymchuk, L.M. Stepasyuk, Z.M. Titenko, и I.M. Yermolenko. (2021 г.) 2021. «MARKET COMPETITION AT THE LEVEL OF AGRICULTURAL PRODUCTS DISTRIBUTION». «Вестник НАН РК», вып. 3 (октябрь):40-44. http://189185.vm7pq.group/bulletin-science/article/view/2032.