1. 21st Century Schools (2010). What is 21st century education? Retrieved April 22, 2015 from http://www.21stcenturyschools.com/What_is_21st_Century_Education.htm
2. American Association of Colleges and Universities. (2007). College learning for the new global century. Washington, DC: AACU.
3. Asian Development Bank. (2007). Moving toward knowledge-based economies: Asian experiences. Regional Sustainable Development Department, Asian Development Bank.
4. Bee, H., & Boyd, D. (2002). Lifespan development (3rd ed.). Boston: Allyn and Bacon.
5. Black, R. (2009). English-language learners, fan communities, and 21st-century skills. Journal of Adolescent & Adult Literacy, 52(8), 688–697.