我被要求澄清这个问题，希望这更清楚。
使用 bookdown 构建书籍时，脚注中的引用不会出现在特定章节的参考文献部分，但会出现在书籍末尾的全局参考文献中。下面的例子。
# Introduction {#intro}
Lorem ipsum.
You can write citations, too. For example, we are using the **bookdown** package [@R-bookdown] in this sample book, which was built on top of R Markdown and **knitr** [@xie2015].
This is a citation [@johndoe2020a].[^note1]
Citations in footnotes in line doesn't work either^[This is another footnote that contains a citation @bobjohnson2018]
The citations in the footnotes do not show up in the end of chapter references section (right below this line), but …