Григорьева, М. “ANALYSIS OF THE INFLUENCE OF MENTAL ARITHMETICS ON THE DEVELOPMENT OF THE INTEGRATED PERSONALITY OF PRIMARY SCHOOL PUPILS”. SWorldJournal 7, no. 06-07 (December 30, 2020): 87–96. Accessed May 3, 2024. https://www.sworldjournal.com/index.php/swj/article/view/swj06-07-142.