References

ESOL, C. (2002). Cambridge IELTS 3. Cambridge University Press.

ESOL, C. (2005). Cambridge IELTS 4. Cambridge University Press.

ESOL, C. (2006). Cambridge IELTS 5. Cambridge University Press.

ESOL, C. (2007). Cambridge IELTS 6 . Cambridge University Press.

ESOL, C. (2009). Cambridge IELTS 7. Cambridge University Press.

ESOL, C. (2011). Cambridge IELTS 8. Cambridge University Press.

ESOL, C. (2013). Cambridge IELTS 9. Cambridge University Press.

ESOL, C. (2015). Cambridge IELTS 10. Cambridge University Press.

ESOL, C. (2016). Cambridge IELTS 11 Academic . Cambridge University Press .

ESOL, C. (2017). Cambridge IELTS 12 Academic . Cambridge University Press.

ESOL, C. (2018). Cambridge IELTS 13. Cambridge University Press.

ESOL, C. (2019). Cambridge IELTS 14 Academic . Cambridge University Press.

ESOL, C. (2020). Cambridge IELTS 15 Academic . Cambridge University Press.

Pauline Cullen; Amanda French & Vanessa Jakeman . (2014). The Official Cambridge Guide to IELTS . Cambridge University Press.