Hidayah, Nurul, Diniyah Kholidah, & Annasari Mustofa. " NUTRITION EDUCATION WITH THE MEDIA BOOKLET AGAINST THE LEVEL OF KNOWLEDGE, CALCIUM INTAKE AND PHYSICAL ACTIVITY TO PREVENT OSTEOPOROSIS IN THE ELDERLY." Jurnal Pendidikan Kesehatan (e-Journal) [Online], 8.1 (2019): 79 - 92. Web. 17 Jan. 2022