Khác biệt giữa bản sửa đổi của “Ô (vật dụng)”
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* M. C. Miller, "The Parasol: An Oriental Status-Symbol in Late Archaic and Classical Athens", JHS 112 (1992), p. 91 [91–105].
* Needham, Joseph (1986). Science and Civilization in China: Volume 4, Physics and Physical Technology, Part 2: Mechanical Engineering. Taipei: Caves Books, Ltd. Page 70.
* Chuyên trang sản xuất Ô đẹp (http://odep.com.vn)
* Needham, Joseph (1986). Science and Civilization in China: Volume 4, Physics and Physical Technology, Part 2: Mechanical Engineering. Taipei: Caves Books, Ltd. Page 70–71.
* Needham, Joseph (1986). Science and Civilization in China: Volume 4, Physics and Physical Technology, Part 2: Mechanical Engineering. Taipei: Caves Books, Ltd. Page 71.
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