Novita Sary, Maryam. 2019. “THe EFFECTIVENESS WATER INTRODUCTION LEARNING MODEL (MNS) BASED ON PLAY IN SWIMMING SPORT”. IJER - INDONESIAN JOURNAL OF EDUCATIONAL REVIEW 6 (1), 159-67. http://103.8.12.212:33180/unj/index.php/ijer/article/view/23254.