Haryani, Heni. 2024. “PENINGKATAN KETERAMPILAN MENULIS PERSONAL LETTER MELALUI MODEL PROBLEM BASED LEARNING PADA SISWA KELAS XI SMKS PRIMA WISATA JAKARTA”. Jurnal Analisis Pendidikan Sosial 1 (5):69-77. https://journal.sintesia.id/index.php/japs/article/view/53.