diff --git a/part10/README.md b/part10/README.md
index 1901892..c913743 100644
--- a/part10/README.md
+++ b/part10/README.md
@@ -37,6 +37,4 @@ Then visit [localhost:8000](http://localhost:8000) and choose `HtmlRunner.elm`.
 
 ## References
 
-* [Using Elm packages](https://github.com/elm-lang/elm-package/blob/master/README.md#basic-usage)
-* [elm-test documentation](http://package.elm-lang.org/packages/elm-community/elm-test/latest)
-* [`(<|)` documentation](http://package.elm-lang.org/packages/elm-lang/core/latest/Basics#<|)
+* [Html.map](http://package.elm-lang.org/packages/elm-lang/html/1.1.0/Html-App#map)
diff --git a/part12/README.md b/part12/README.md
index 167c061..d2fb347 100644
--- a/part12/README.md
+++ b/part12/README.md
@@ -16,12 +16,7 @@ elm-package install
 elm-live Main.elm --open --pushstate --output=elm.js
 ```
 
-## Compiling CSS
-
-```bash
-elm-css Stylesheets.elm
-```
-
 ## References
 
-* [Elm CSS documentation](http://package.elm-lang.org/packages/rtfeldman/elm-css/latest)
+* [Debug.log](http://package.elm-lang.org/packages/elm-lang/core/latest/Debug#log)
+* [lazy](http://package.elm-lang.org/packages/elm-lang/html/latest/Html-Lazy#lazy)
diff --git a/part14/README.md b/part14/README.md
index f5615f9..a2aeda4 100644
--- a/part14/README.md
+++ b/part14/README.md
@@ -24,4 +24,4 @@ elm-css Stylesheets.elm
 
 ## References
 
-* [Elm CSS documentation](http://package.elm-lang.org/packages/rtfeldman/elm-css/latest)
+* [Elm in Action](https://www.manning.com/books/elm-in-action?a_aid=elm_in_action&a_bid=b15edc5c)