Kazbekova L., Kurmangali A., Yerniyazova Zh., Akhmetova A., и Utegenova K. «MODELS OF DEFINED CONTRIBUTION PENSION SYSTEMS IN FOREIGN COUNTRIES». Academic Journal of Physical and Chemical Sciences, вып. 4, август 2020 г., сс. 186-93, http://89.250.84.46/reports-science/article/view/1043.