NINAWATI, Mimin. DEVELOPMENT OF SEX EDUCATION BOOKS FOR ELEMENTARY SCHOOL STUDENTS. JURNAL INDRIA (Jurnal Ilmiah Pendidikan Prasekolah dan Sekolah Awal), [S.l.], v. 3, n. 3, dec. 2018. ISSN 2528-004X. Available at: <http://journal.umpo.ac.id/index.php/indria/article/view/1435>. Date accessed: 19 sep. 2019.