Betsis, A. (2014). Succeed in ielts speaking and vocabulary: Ideal for both the academic and the general training modules. Thành phố Hồ Chí Minh: Tổng hợp.
शिकागो स्टाइल उद्धरणBetsis, Andrew. Succeed in Ielts Speaking and Vocabulary: Ideal for Both the Academic and the General Training Modules. Thành phố Hồ Chí Minh: Tổng hợp, 2014.
एमएलए उद्धरणBetsis, Andrew. Succeed in Ielts Speaking and Vocabulary: Ideal for Both the Academic and the General Training Modules. Thành phố Hồ Chí Minh: Tổng hợp, 2014.
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