Betsis, A. (2014). Succeed in Cambridge English Preliminary (PET): Preliminary English test (Pet). 10 Practice Tests. Thành phố Hồ Chí Minh: Tổng hợp.
शिकागो स्टाइल उद्धरणBetsis, Andrew. Succeed in Cambridge English Preliminary (PET): Preliminary English Test (Pet). 10 Practice Tests. Thành phố Hồ Chí Minh: Tổng hợp, 2014.
एमएलए उद्धरणBetsis, Andrew. Succeed in Cambridge English Preliminary (PET): Preliminary English Test (Pet). 10 Practice Tests. Thành phố Hồ Chí Minh: Tổng hợp, 2014.
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