| North gate on the western wall of the Chinese town : 1900 | North gate on the western wall of the Chinese town : 1750 |
| North gate on the western wall of the Chinese town in Ein Tagebuch in Bildern, published by 1902 | North gate on the western wall of the Chinese town in The Complete Map of Peking, Qianlong Period. |
| http://dsr.nii.ac.jp/toyobunko/La-161/V-1/page/0063.html.en |