> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://authorea.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How to use the citation tool

To add a citation in Authorea, select the `Cite `button on the toolbar of any active document.
The `Cite` button calls a window which provides several options for citations.

The first option is to search Crossref for citation information. The search functionality supports search by author name, year, publication, or keyword.

![](https://storage.crisp.chat/users/helpdesk/website/d38f777e-0276-4c52-8a15-b5855ac4903c/42d6f247-d5f3-4ecc-ae70-337ad2910392.png)

Select `Add` next to the citation to add it to the modal.  You can search for another citation and add it to the first citation if you would like to cite multiple sources at once.

![](https://storage.crisp.chat/users/helpdesk/website/d38f777e-0276-4c52-8a15-b5855ac4903c/05f6756d-e31c-433d-a6c6-f3e9cede5a3d.png)

![](https://storage.crisp.chat/users/helpdesk/website/d38f777e-0276-4c52-8a15-b5855ac4903c/d79e1211-ba77-4724-bf3f-68417e7d6011.png)

To search citations you've already added, you can search `Local.`
 
Citations may also be pulled from popular reference managers Endnote, Mendeley, and Zotero, Google Scholar, and directly from BibTeX.