Kamzanova, A. T., Zhubanazarova, N. S., & Satybaldyna, N. K. (2017). Influence of «Abakus» method on psychological features of pupil. The Journal of Psychology &Amp; Sociology, 59(4). Retrieved from https://bulletin-psysoc.kaznu.kz/index.php/1-psy/article/view/681