Text of Index of Leitmotifs in Chinese & English:
- https://zhuanlan.zhihu.com/p/71501170

Links to References:
- https://pjb.com.au/mus/wagner/index.html
- https://www.wagnerheim.com/
- https://www.douban.com/note/720788059/ (Chinese translation)
- http://blog.sina.com.cn/s/blog_5698ee... (Chinese translation)

This Recording:
-    • Wagner: Götterdämmerung, WWV 86D / Ac...  

Leitmotives from the Ring Cycle:
-    • Wagner Leitmotives - 1 - Nature or Ge...