Solihah, M., Mubarok, T.A. and Saifudin, A. 2023. Development of a Simple English Book to Improve Vocabulary Mastery for X-1 Grade Students at SMAS Raudlatul Ulum Gondanglegi. Journey: Journal of English Language and Pedagogy. 6, 2 (Jul. 2023), 308-316. DOI:https://doi.org/10.33503/journey.v6i2.2883.