# Citation Sources

> Renders inline numbered citation markers in AI-generated text that show a hover preview card with the source title, domain, and snippet, with an optional footnote list at the bottom.

- Author: [Arihant jain](https://21st.dev/@arihantcodes_1f7b8c4d)
- Library: [Spectrum UI](https://21st.dev/@arihantcodes_1f7b8c4d/library/spectrum-ui)
- License: MIT
- Tags: Tooltip, AI Chat, Citation
- Live preview: https://21st.dev/@arihantcodes_1f7b8c4d/components/citation-sources

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/arihantcodes_1f7b8c4d/citation-sources?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/tooltip.md