Anjani, Siti Dwita, and Farida Kurniawati. “Improvement on Distinguishing ‘B’ and ‘D’ Letter : Direct Instruction Flashcards Intervention for A Slow Learner”. Jurnal Paedagogy, vol. 12, no. 1, Jan. 2025, pp. 87-97, doi:10.33394/jp.v12i1.13790.