Asrori, Yusup. “Produktivitas Lansia Di Karangwredha Puntodewo Kelurahan Tanggung Kecamatan Kepanjen Kidul Kota Blitar”. Jurnal Ners dan Kebidanan (Journal of Ners and Midwifery) 1, no. 2 (August 1, 2014): 140–143. Accessed January 14, 2025. http://ojs.phb.ac.id/index.php/jnk/article/view/0026.