Tunurrohmin, Zela, RB. Soemanto, and Eti Poncorini Pamungkasari. 2018. “Path Analysis on the Determinants of Depression Symptom in Elderly: A PRECEDE PROCEED Model”. Journal of Epidemiology and Public Health 4 (4):351-60. https://www.jepublichealth.com/index.php/jepublichealth/article/view/223.