Wiyono, Henry, and Prayogae P. Putra. “The Effect of Breathing Exercises on the Anxiety Level of Preoperative Patients in the Dahlia Room, Dr. Doris Sylvanus Palangka Raya: The Effect of Breathing Exercises on the Anxiety Level of Preoperative Patients in the Dahlia Room, Dr. Doris Sylvanus Palangka Raya”. Jurnal Forum Kesehatan : Media Publikasi Kesehatan Ilmiah, vol. 12, no. 2, Feb. 2023, pp. 51-56, doi:10.52263/jfk.v12i2.123.