diff --git a/_output.yml b/_output.yml
index 201e8a7b..651a61f3 100644
--- a/_output.yml
+++ b/_output.yml
@@ -1,6 +1,12 @@
 bookdown::gitbook:
   css: style.css
+
   config:
+    sharing:
+      github: yes
+      facebook: false
+      twitter: false
+    download: false
     toc:
       collapse: section
       before: |
@@ -9,9 +15,3 @@ bookdown::gitbook:
         <li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li>
     edit:
       link: https://github.com/jennybc/happy-git-with-r/edit/master/%s
-bookdown::pdf_book:
-  includes:
-    in_header: preamble.tex
-  latex_engine: xelatex
-  citation_package: natbib
-bookdown::epub_book: default