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# Adding a Citation  Citation provides information regarding the source of the data. This  section should allow us to locate and access the paper of interest.  A PDF copy of each paper should be available through Mendeley.  1. Select one of the starred papers from your project's Mendeley folder.  2. The data to be entered should be specified in the notes associated  with the paper in Mendeley  3. Identify (highlight or underline) the data (means and statistics)  that you will enter  4. Enter citation information   * [Data entry form](https://www.betydb.org/citations/new) for a new  site: `BETYdb` → `Citations` → `new`  * **Author**: Input the first author’s last name only  * **Year**: Input the year the paper was published, not submitted, reviewed,  or anything else  * Fill out Title, Journal, Vol, & Pg. For unknown information, input 'NA'  * **DOI**: The 'digital object identifier'. If DOI is available, PDF and  URL are optional. This can be located in the article or in the  article website. Use Ctrl+F 'DOI' to find it. Some older  articles do not have a DOI.  * **URL**: Web address of the article, preferably from publisher's website  * **PDF**: URL of the PDF of the article   5. [Form for entering a new citation](https://www.betydb.org/citations/new)