GERHANAWATI, I. PENGARUH KNEE TO CHEST DAN PELVIC TILTING EXERCISE TERHADAP FLEKSIBILITAS PUNGGUNG BAWAH PADA PEKERJA ADMINISTRASI DALAM AKTIVITAS DUDUK LAMA: The Effects of Knee-To-Chest and Pelvic Tilting Exercise on Lower Back Flexibility of Administrative Officers Who Sit for A Long Period . Jurnal Ilmiah Keperawatan (Scientific Journal of Nursing), v. 7, n. 2, p. 195-203, 1 Oct. 2021.