Huriani, E., S. P. Olimviani, and H. Putra. “Handheld Technique Compared to Deep Breathing Technique in Reducing Anxiety Before Cardiac Catheterization”. Indonesian Contemporary Nursing Journal (ICON Journal), vol. 6, no. 1, Aug. 2021, pp. 12-20, doi:10.20956/icon.v6i1.13054.