Yeung, A. S., K. M. Lim, E. G. Tay, A. C. Lam-Chiang, and C. Hui. “Relating Use of Digital Technology by Pre-Service Teachers to Confidence: A Singapore Survey”. Australasian Journal of Educational Technology, vol. 28, no. 8, Nov. 2012, doi:10.14742/ajet.774.