Choirun Nisak Nur, L., and U. Wulan Agustina. “THE EFFECT OF ESP COURSE BOOK ON STUDENT’S SPEAKING ABILITY”. Ed-Humanistics : Jurnal Ilmu Pendidikan, vol. 3, no. 2, Nov. 2018, https://ejournal.unhasy.ac.id/index.php/ed-humanistics/article/view/305.