# Citations

> A collapsible list of source references paired with inline numbered citation markers, used to ground an AI/agent response in the sources it cites.

- Author: [Saurabh](https://21st.dev/@starc007)
- Library: [beUi](https://21st.dev/@starc007/library/saurra3h)
- License: MIT
- Tags: Citation, AI Chat, Collapsible
- npm dependencies: motion, lucide-react
- Live preview: https://21st.dev/@starc007/components/citations

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/starc007/citations?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