Shoshanov Saken Bakhytzhanovich, Makhanov Sagat Sultanbekovich, Salykova Leila Nurtleuovna, и Petr Hajek. «ORGANIZATION OF REFINED PRODUCTS SALES IN KAZAKHSTAN». «Вестник НАН РК», вып. 1, февраль 2021 г., сс. 194-01, http://89.250.84.46/bulletin-science/article/view/383.