Ryazantsev Sergey Vasilievich. «MIGRANT WORKERS AS A RESOURCE FOR THE DEMOGRAPHIC DEVELOPMENT OF RUSSIA AND THE REPUBLIC OF KAZAKHSTAN». «Вестник НАН РК», вып. 2, апрель 2021 г., сс. 204-12, https://journals.nauka-nanrk.kz/bulletin-science/article/view/221.