Sihombing, Heny Indriyani. “Implementation Of The Semi Fowler Position To Improve The Effectiveness Of Breathing Patterns In Congestive Heart Failure (CHF) Patients At Vita Insani Pematangsiantar Hospital”. COVID-19 : Journal of Health, Medical Records and Pharmacy, vol. 2, no. 01, Sept. 2024, pp. 30-36, https://jurnal.devitara.or.id/index.php/sehat/article/view/113.