# Source Citation Rail

> A citation panel that keeps inline \[n\] reference markers in an AI answer synced with a side list of sources, with active highlighting, expandable excerpts, copy-link, and keyboard navigation.

- Author: [Mehi](https://21st.dev/@rmahammad)
- Library: [Motiq](https://21st.dev/@rmahammad/library/motiq)
- License: MIT
- Tags: Citation, AI
- npm dependencies: motion
- Live preview: https://21st.dev/@rmahammad/components/source-citation-rail

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/rmahammad/source-citation-rail?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/citation.md