INA, AGUSTINA. “INFLUENCE OF PLAYGROUP ON THE DEVELOPMENT OF CHILDREN AGED 4-6 YEARS OF WORKING MOTHERS (A RETROSPECTIVE COHORT STUDY AT A PRIVATE KINDERGARTEN, KUPANG)”. JURNAL INFO KESEHATAN, vol. 12, no. 1, June 2014, pp. 585-98, https://jurnal.poltekkeskupang.ac.id/index.php/infokes/article/view/42.