1. Busse, V., & Walter, C. (2013). Foreign Language Learning Motivation in Higher Education: A Longitudinal Study of Motivational Changes and their Causes.Modern Foreign Language Journal, 97, 435-456.

2. Coyle, D, Hood, P, & Marsh, D. ( 2010). Content and Language Integrated Learning. Cambridge University Press.

3. Dalton-Puffer, C. (2011). Content and Language Integrated Learning – from Practice to Principles. Annual Review of Applied Linguistics, 31, 182-204.

4. Dalton-Puffer, C., &Nikula, T. (2014). Guest editorial: Content and Language Integrated Learning. Language Learning Journal, 42, 117-122.

5. Dörnyei, Z., &Ushioda, E. (2011). Teaching and Researching Motivation. Harlow: Pearson. Dudley-Evans, T., & St John, M. J. (1998). Developments in English for Specific Purposes: A Multi-disciplinary Approach. Cambridge: Cambridge University Press.

6. Duff, A. (1989). Translation. Oxford: Oxford University Press.

7. Fortanet-Gómez, I. (2013). CLIL in Higher Education: towards a Multilingual Language Policy. Bristol: Multilingual Matters.

8. Gairns, R & Redman, S.(1993) Working with Words. Cambridge: CUP Gilmore, A.(2007). Authentic Materials and Authenticity in Foreign Language Learning. Language Teaching 40,97-118.

9. Ioannou Georgiou, S. (2012). A Longitudinal Study on the Impact of CLIL on effective factors. Applied Linguistics, 14, 279-291.

10. Jeremy Harmer (2007). How to teach English, Cambridge University Press Lasagabaster, D. & Doiz, A. & Sierra, J. M. (Eds). (2014). Motivation and Foreign Language Learning : from Theory to Practice. Amsterdam: John Benjamins.

11. Laufer, B. (2005), Focus on form in Second Language Vocabulary Learning, EUROSLA Yearbook, 5. Amsterdam: Benjamins, Michael McCarthy. 1990. Vocabulary, Oxford University Press.

12. Pinner, R.S ( 2013). Authenticity and CLIL: Examining Authenticity from an International CLIL Perspective. International CLIL Research Journal,2, 44-45.