Khalid, M. S., Alias, M., Razally, W., Yamin, S., & Herawan, T. (2010). The effect of using an interactive multimedia courseware within a collaborative learning environment on the learning of pre-algebra concepts among pre-university engineering students. Elsevier.

Khalid, Mohd Sazali, Maizam Alias, Wahid Razally, Sulaiman Yamin, and Tutut Herawan. The Effect of Using an Interactive Multimedia Courseware Within a Collaborative Learning Environment On the Learning of Pre-algebra Concepts Among Pre-university Engineering Students. Elsevier, 2010.

Khalid, Mohd Sazali, et al. The Effect of Using an Interactive Multimedia Courseware Within a Collaborative Learning Environment On the Learning of Pre-algebra Concepts Among Pre-university Engineering Students. Elsevier, 2010.