riski, riskirivaldo. “THE DESCRIPTION OF STRESS LEVEL ON GRADE THIRD STUDENTS IN SMPN 9 PEKANBARU BEFORE FACING THE NATIONAL EXAMINATIONS”. Jurnal Medika Hutama, Vol. 2, no. 02 Januari, Jan. 2021, pp. 448-55, https://www.jurnalmedikahutama.com/index.php/JMH/article/view/110.