Utami, Rina Puji. “Using Word Wall Technique Towards The Students’ Vocabulary Mastery At The Eleventh Grade of Vocational High School Students ”. Dharma Pendidikan 15, no. 1 (Desember 8, 2020): 64-73. Diakses Februari 28, 2021. https://journal.stkipnganjuk.ac.id/index.php/jdp/article/view/65.