1. Agustín-Llach, M. P. (2015). Age and type of instruction (CLIC vs traditional EFL) in lexical development. International Journal of English Studies, 16(1), 75-96. doi:10.6018/ijes/2016/1/220691.
2. Andersson, E. (2019). Teachers' Attitudes Affect Students : A Study of Swedish Primary School Teachers' Attitudes towards CLIL: Doktorska disertacija. https://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29832.
3. Ball, P. (2009). Does CLIL work? V: D. Hill, & P. Alan (ur.), The Best of Both Worlds? International Perspectives on CLIL. Norwich: Norwich Institute for Language Education, 32-43.
4. Ball, P., Kelly, K., in Clegg, J. (2015). Putting CLIL into practice. Oxford: Oxford University Press.
5. Barbe, W. B., Swassing, R. H., in Milone, M. N. (1979). Teaching through modality strengths: Concepts and practices. Columbus, Ohio: Zaner-Bloser.