Lougheed, L. (2012). IELTS international English language testing system (Barron's the leader in test preparation). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh.
শিকাগো স্টাইলে সাইটেশনLougheed, Lin. IELTS International English Language Testing System (Barron's the Leader in Test Preparation). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2012.
এমএলএ সাইটেশনLougheed, Lin. IELTS International English Language Testing System (Barron's the Leader in Test Preparation). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2012.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.