Kovacs, K. E. (2019). Speaking for IELTS (Second edition.). Collins.
Chicago Style (17th ed.) ZitazioaKovacs, Karen E. Speaking for IELTS. Second edition. London: Collins, 2019.
MLA (9th ed.) ZitazioaKovacs, Karen E. Speaking for IELTS. Second edition. Collins, 2019.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.