RAngelin Purba, R. et al. 2025. The Effect of Laughter Therapy, a Low-Salt Diet, Exercise, and Physical Activity on Reducing Blood Pressure in Elderly Patients at the Sei Kepayang Timur Community Health Center, Asahan Regency. International Journal of Health and Pharmaceutical (IJHP). 5, 4 (Nov. 2025), 990–997. DOI:https://doi.org/10.51601/ijhp.v5i4.502.