Masturoh, Siti, et al. “The Use of Crossword Puzzle to Improve Students’ Adjective Vocabulary”. Prosiding Seminar Nasional Pendidikan Profesi Guru, vol. 1, no. 2, Nov. 2023, pp. 457-69, https://conference.upgris.ac.id/index.php/psnppg/article/view/5139.