S. Sonedi, “Hubungan Kepemimpinan Kepala Sekolah dan Sikap Guru Terhadap Pekerjaan dengan Kompetensi Profesional Guru: The Relationship of Principal Leadership and Teachers’ Attitude to their Work with the Teacher’s Professional Competence”, Anterior J, vol. 16, no. 1, pp. 14–27, Dec. 2016.