Tanabe, Makoto, et al. “The Class Practice for Advancing from CS Unplugged to Full-Fledged Programming”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 5, Nov. 2015, pp. 43-50, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/4747.