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3. 3. Cunningsworth, A. Choosing Your Course-book, Oxford, Heinemann, 1995
4. 4. Dudley-Evans, T. and St. John, M.J., Developments in English for Specific Purposes: A Multi-Disciplinary Approach, Cambridge University Press, Cambridge, 1998;
5. 5. Gaffield-Vile, N. Content-based second language instruction at the tertiary level. ELT Journal 50 (2) 1996;10.1093/elt/50.2.108