Kovacs, K. (2012). Speaking for IELTS: (Collins English for exams). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh.
শিকাগো স্টাইলে সাইটেশনKovacs, Karen. Speaking for IELTS: (Collins English for Exams). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2012.
এমএলএ সাইটেশনKovacs, Karen. Speaking for IELTS: (Collins English for Exams). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2012.
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