Shely Perbina, dan Ayu. “THE CORRELATION BETWEEN STUDENTS’ UNDERSTANDING IN WH- QUESTIONS AND THEIR SPEAKING ABILITY IN EXPRESSION OF ASKING AND GIVING OPINIONS OF THE EIGHTH YEAR STUDENTS OF SMP SWASTA HARAPAN BANGSA KUALA”. Serunai : Jurnal Ilmiah Ilmu Pendidikan, vol. 7, no. 1, Juli 2021, hlm. 28-38, https://www.ejournal.stkipbudidaya.ac.id/index.php/serunai/article/view/399.