diff --git a/citations-and-styles.Rmd b/citations-and-styles.Rmd
index e7d702e..6f55a9b 100644
--- a/citations-and-styles.Rmd
+++ b/citations-and-styles.Rmd
@@ -65,7 +65,7 @@ And for ggplot2 with
 citation("ggplot2")
 ```
 
-For journals or books, you'll need to get a specific .bib file. Yes, this can be a bit of a pain, but this is where you need to use a reference management software like [Zotero](https://www.zotero.org/), [Mendeley](https://www.mendeley.com/download-desktop/), or my personal preference [paperpile](https://paperpile.com/). These all allow you to get .bib files of your articles, which you can then placec in your `references.bib` file.
+For journals or books, you'll need to get a specific .bib file. Yes, this can be a bit of a pain, but this is where you need to use a reference management software like [Zotero](https://www.zotero.org/), [Mendeley](https://www.mendeley.com/download-desktop/), [papers](https://www.papersapp.com/), or my personal preference [paperpile](https://paperpile.com/). The important thing to to **use something**. These all allow you to get .bib files of your articles, which you can then placec in your `references.bib` file.
   
 ### Exercise {.exercise}
 
diff --git a/figs/rstudio-remove-data.png b/figs/rstudio-remove-data.png
new file mode 100644
index 0000000..7e296d4
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diff --git a/figs/rstudio-screenshot.png b/figs/rstudio-screenshot.png
new file mode 100644
index 0000000..efe3cbf
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diff --git a/index.Rmd b/index.Rmd
index 6f4c6a5..dff6075 100644
--- a/index.Rmd
+++ b/index.Rmd
@@ -31,7 +31,7 @@ We may, depending on time, also cover the following areas:
 
 ## Why write this as a book?
 
-There are many great books on rmarkdown and it's various features, such as "Rmarkdown: The definitive guide", and Yihui's two books, "...", "...", and his thesis, "...".
+There are many great books on rmarkdown and it's various features, such as ["Rmarkdown: The definitive guide"](https://bookdown.org/yihui/rmarkdown/), ["bookdown: Authoring Books and Technical Documents with R Markdown"](https://bookdown.org/yihui/bookdown/), and ["Dynamic Documents with R and knitr. 2nd edition"](https://www.crcpress.com/Dynamic-Documents-with-R-and-knitr/Xie/p/book/9781498716963), and Yihui Xie's thesis, ["Dynamic Graphics and Reporting for Statistics"](https://lib.dr.iastate.edu/etd/13518/).
 
 > So why write a book?
 
diff --git a/rstudio.Rmd b/rstudio.Rmd
index 831cf30..19eb759 100644
--- a/rstudio.Rmd
+++ b/rstudio.Rmd
@@ -25,7 +25,7 @@ If R is the engine and bare bones of your car, then RStudio is like _the rest of
 
 The image below shows us the general layout of RStudio. Notice the following features:
 
-```{r rstudio-screenshot, eval = FALSE, echo = FALSE, fig.cap = "A screenshot of the RStudio working environment."}
+```{r rstudio-screenshot, echo = FALSE, fig.cap = "A screenshot of the RStudio working environment."}
 knitr::include_graphics("figs/rstudio-screenshot.png")
 ```
 
@@ -50,7 +50,7 @@ Tools > Global Options (Or `Command + ,`)
 - Under workspace, uncheck restore .RData into workspace at startup
 - Save workspace to .RData on exit : "Never"
 
-```{r fig-rstudio-workspace-options, fig.cap = "Setting the options right for rstudio, so you don't restore previous sessions work, and don't save it either."}
+```{r fig-rstudio-workspace-options, fig.cap = "Setting the options right for rstudio, so you don't restore previous sessions work, and don't save it either.", out.width = "50%"}
 knitr::include_graphics("figs/rstudio-remove-data.png")
 ```