added links to LINK, european-agency and studenttoolkik

accessibility-of-documents/accessibility-overview.md

@@ -55,4 +55,8 @@ In case of non-accessible documents there are frameworks and services trying to
 # List of resources
 
 The following resources are recommended for research
-  * [Developer Space for AT](https://ds.gpii.net/)
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+  * [Developer Space for AT](https://ds.gpii.net/)
+  * [LINK network: Teaching & Learning](http://www.thelinknetwork.eu/index.php/teaching-a-leaning)
+  * [Euorpean-Agency for Special Needs and Inclusive Education](https://www.european-agency.org/)
+  * [studenttoolkik.eu](https://studenttoolkit.eu/)
+  * 
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