1. OECD, PISA 2012 Results in Focus (OECD, Paris, 2014), pp. 1–44.
2. A. Ishak, Z. Kasa, M. H. Selamat, and B. A. Samah, Journal of Information Technology and Multimedia, 5, 79–89 (2009).
3. M. del M. García and I. Romero, Electronic Journal of Research in Educational Psychology, 7, 369–395 (2009).
4. M. Puteh and R. Masri, “Geometer Sketchpad:Penggunaannya dalam Pembelajaran Matematik Tambahan,” in Menanggapi Keberkesanan Dan Perubahan, edited by A. H. Ali (Universiti Pendidikan Sultan Idris (UPSI), Tanjung Malim, 2006) pp. 101–115.
5. J. Furner and B. Berman, “Confidence in Their Ability to Do Mathematics, The Need to Eradicate Math Anxiety so Our Future Students can Succesfully Compete in a High-Tech Globally Competitive World,” in Dimensions in Mathematics, edited by L. C. Parnault (Harvard University Press, Massachusetts, 2005) pp. 28–31.