Patricia Ackert. (1998). Facts and figures with answers (Song ngữ). Tp.HCM: Trẻ.
शिकागो स्टाइल उद्धरणPatricia Ackert. Facts and Figures With Answers (Song Ngữ). Tp.HCM: Trẻ, 1998.
एमएलए उद्धरणPatricia Ackert. Facts and Figures With Answers (Song Ngữ). Tp.HCM: Trẻ, 1998.
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