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# Footnotes and citations
## Footnotes
Footnotes are put inside the square brackets after a caret `^[]`. Like this one ^[This is a footnote.].
## Citations
Reference items in your bibliography file(s) using `@key`.
For example, we are using the **bookdown** package [@R-bookdown] (check out the last code chunk in index.Rmd to see how this citation key was added) in this sample book, which was built on top of R Markdown and **knitr** [@xie2015] (this citation was added manually in an external file book.bib).
Note that the `.bib` files need to be listed in the index.Rmd with the YAML `bibliography` key.
<!--bs4_book:start-->
The `bs4_book` theme makes footnotes appear inline when you click on them. In this example book, we added `csl: chicago-fullnote-bibliography.csl` to the `index.Rmd` YAML, and include the `.csl` file. To download a new style, we recommend: https://www.zotero.org/styles/
<!--bs4_book:end-->
The RStudio Visual Markdown Editor can also make it easier to insert citations: <https://rstudio.github.io/visual-markdown-editing/#/citations>
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