diff --git a/_overviews/scala3-book/types-others.md b/_overviews/scala3-book/types-others.md
index a5ae730b1..f2db8a42b 100644
--- a/_overviews/scala3-book/types-others.md
+++ b/_overviews/scala3-book/types-others.md
@@ -21,7 +21,9 @@ Scala has several other advanced types that are not shown in this book, includin
 - Refinement types
 - Kind polymorphism
 
-For more details on these types, see the [Scala 3 Reference documentation][reference].
+For more details on most of these types, refer to the [Scala 3 Reference documentation][reference]. 
+For singleton types see the [literal types](https://scala-lang.org/files/archive/spec/3.4/03-types.html#literal-types) section of the Scala 3 spec, 
+and for refinement types, see the [refined types](https://scala-lang.org/files/archive/spec/3.4/03-types.html) section.