Putri A.P., Suparno S., Issaliyeva S., Issaliyeva S., Retnawati H, Arpentieva M.R., и Kassymova G.K. «EFFECT OF PROBLEM BASED LEARNING MODELS ON THE ABILITY TO REMEMBER ENGLISH VOCABULARY IN PRESCHOOL». «Вестник НАН РК», вып. 3, июнь 2020 г., сс. 202-10, http://91834.libg.asia/bulletin-science/article/view/523.