I do apologise if this is a stupid question. Hope you can help out!

# Problem

**I just want to cite in .Rmd, but the output latex file can't be compiled normaly however hard I try.**

this is the yaml:

```
---
title: "test cross-refering"
author: "name"
date: "date"
output:
bookdown::pdf_document2:
keep_tex: true
keep_md: true
includes:
in_header: extarticle.tex
toc: true
toc-depth: 3
fontsize: 12pt
documentclass: extarticle
bibliography: testref.bib
geometry: margin=1in
numbersections: true
header-includes: \setlength{\parindent}{2em}
mathspec: true
abstract: abstract
---
```

the .bib is like this :

```
@Manual{R-base,
title = {R: A Language and Environment for Statistical
Computing},
author = {{R Core Team}},
organization = {R Foundation for Statistical Computing},
address = {Vienna, Austria},
year = {2019},
url = {https://www.R-project.org},
}
```

which is copied from a tutorial.

**But it results in** :

```
! LaTeX Error: Lonely \item--perhaps a missing list environment.
```

while the output .tex is like this (**Error part**):

```
\phantomsection\label{refs}
\begin{CSLReferences}{1}{0}
\bibitem[\citeproctext]{ref-R-base}
R Core Team. 2019. \emph{R: A Language and Environment for Statistical Computing}. Vienna, Austria: R Foundation for Statistical Computing. \url{https://www.R-project.org}.
\end{CSLReferences}
```

It seems texlive is not able to compile this part. Obviously, it looks not very neat and normal like a common bibliography itself. Pandoc did it and I don't know why the error.

I have changed the bib file several times but it still does not work. **How can I cite in R markdown correctly and efficiently?**

I can't thank you enough for giving me some suggestions!