J. J. Hassan and M. Hamzah, “Halangan-halangan pengurusan sekolah rendah dalam mewujudkan sekolah berkesan di zon utara (Perlis, Kedah dan Pulau Pinang): Tindakan dan keperluan Guru Besar dan guru-guru Penolong Kanan menanganinya: The Primary School Management Obstacles in Establishing Effective School in the Northern Zone (Perlis, Kedah and Pulau Pinang): Actions and the Needs of the Headmasters”, JPB, vol. 13, no. 2, pp. 12–28, Sep. 2020.