1. Bogdan, R. C., & Biklen, S. K. (2007). Qualitative research for education: an introduction to theories and methods (5th ed.). Pearson Education Inc.
2. Bybee, B. (2010). Advancing STEM education: a 2020 vision. Technology and Engineering Teacher, 70(1), 30–35.
3. Bybee, R. W. (2013). The case for STEM education challenges and opportunities. NSTA.
4. Byram, M. (1997). Teaching and assessing intercultural communicative competence (multilingual matters). Multilingual Matters.
5. Byram, M., Gribkova, B., & Starkey, H. (2002). Developing the intercultural dimension in language teaching: a practical introduction for teachers. Retrieved from http://www.lrc.cornell.edu/director/intercultural.pdf