Perpustakaan Link Jurnal: 1. www.ncbi.nlm.nih.gov 2. ristekdikti.summon.serialssolution.com 3. search.proquest.com 4. infotrac.galegroup.com/itweb 5. search.epnet.com 6. sinta2.ristekdikti.go.id 2019-05-27 stikes