Sumeru, A., and D. Mustikasari. “The Use of Self-Monitoring Urine Chart (PURI) in Older Adults to Prevent Dehydration: A Literature Review”. Journal of Bionursing, Vol. 2, no. 1, Jan. 2020, pp. 1-8, doi:10.20884/1.bion.2020.2.1.38.