Rita Dwi Pratiwi, Riris Andriati, and Fenita Purnama Sari Indah. “THE POSITIVE EFFECT OF EDUCATIVE GAME TOOLS (PUZZLE) ON COGNITIVE LEVELS OF PRE-SCHOOL CHILDREN (4-5 YEARS)”. The Malaysian Journal of Nursing (MJN), vol. 11, no. 3, Jan. 2020, pp. 35-41, doi:10.31674/mjn.2020.v11i03.006.