Mujimin, Mujimin. “Objectivitas Penilaian Portofolio Sertifikasi Guru Dalam Jabatan”. JPK (Jurnal Pendidikan Khusus) 3, no. 1 (May 15, 2007). Accessed May 19, 2025. https://journal.uny.ac.id/index.php/jpk/article/view/6411.