The Effects of Van Hiele's Phase-Based Learning on Students' Geometric Achievement and Attitude towards Geometry. - Abdul Halim Abdullah; Nor Hasniza Ibrahim; Johari Surif; Effandi Zakaria (LaTiCE, 2014)

The Effectiveness of Integrating Geometer's Sketchpad Software in Phase-Based Geometric Learning. - Abdul Halim Abdullah; Norasykin Mohd Zaid; Mohd Salleh Abu; Mohd Hilmi Hamzah; Effandi Zakaria; Umar Haiyat Abdul Kohar (TALE, 2018)