“THE USING OF RIDDLE TECHNIQUE TO INCREASE STUDENTS’ VOCABULARY MASTERY IN DESCRIBING PEOPLE AT SMA SWASTA KARTIKA 1-4 PEMATANGSIANTAR”. 2019. Bilingual : Jurnal Pendidikan Bahasa Inggris 1 (1): 14 – 20. https://doi.org/10.36985/q5167k51.