Southern, A., & Wallwork, A. (2009). Science and Enviroment: Series 2. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh.
शिकागो स्टाइल उद्धरणSouthern, Anna, और Adrian Wallwork. Science and Enviroment: Series 2. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh, 2009.
एमएलए उद्धरणSouthern, Anna, और Adrian Wallwork. Science and Enviroment: Series 2. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh, 2009.
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