 | ISBN 978-1-57607-335-3. Retrieved 6 May 2013. 熊正坤; 张瑾 (8 April 2021). "乍得湖：从"文明摇篮"到"死亡之心"" [Lake Chad: From "Cradle of Civilization" to "Heart of Death"]... 40 KB (4,643 words) - 18:13, 23 April 2024 |
| ISBN 978-1-57607-335-3. Retrieved 6 May 2013. 熊正坤; 张瑾 (8 April 2021). "乍得湖：从"文明摇篮"到"死亡之心"" [Lake Chad: From "Cradle of Civilization" to "Heart of Death"]... 40 KB (4,643 words) - 18:13, 23 April 2024 |