Carol Gibson. (1998). IELTS những điều cần biết: The ABC of IELTS (Practice tests in reading and writing. Tp. HCM: Nxb. Tp. HCM.
Chicago Style aipamenaCarol Gibson. IELTS Những điều Cần Biết: The ABC of IELTS (Practice Tests in Reading and Writing. Tp. HCM: Nxb. Tp. HCM, 1998.
MLA aipamenaCarol Gibson. IELTS Những điều Cần Biết: The ABC of IELTS (Practice Tests in Reading and Writing. Tp. HCM: Nxb. Tp. HCM, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.