Astuti, Yuli, and Dyah Artini. “COMPARATIVE HEMOGLOBIN AND HEMATOCRIT BEFORE AND AFTER DONATION TO BLOOD DONATE IN UNIT TRANSFUSION YOGYAKARTA CITY”. Jurnal Riset Kesehatan, vol. 8, no. 2, Nov. 2019, pp. 40-42, doi:10.31983/jrk.v8i2.5362.