diff --git a/_config.yml b/_config.yml
index 4edecb1..1252bff 100644
--- a/_config.yml
+++ b/_config.yml
@@ -60,6 +60,8 @@ html:
   use_multitoc_numbering: false
 
 sphinx:
+  extra_extensions:
+    - sphinx_apa_references
   config:
     bibtex_reference_style: author_year
     html_show_copyright: false
diff --git a/requirements.txt b/requirements.txt
index 1f6ff06..c5fb89f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
 jupyter-book==1.0.4
+teachbooks==0.2.3
+sphinx_apa_references==1.0
 jupyterquiz==2.8.*
 matplotlib
 numpy