diff --git a/free-programming-books.md b/free-programming-books.md
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@@ -632,7 +632,6 @@ Original Source: [List of freely available programming books](http://web.archive
 * [How to Write Unmaintainable Code](http://mindprod.com/jgloss/unmain.html)
 * [Kanban and Scrum - making the most of both](http://www.infoq.com/minibooks/kanban-scrum-minibook)
 * [Kanban for skeptics](https://leanpub.com/kanbanforskeptics) (Leanpub, by Nick Oostvogels)
-* [Methods and Techniques for the Design and Implementation of Domain-Specific Languages](http://www.st.ewi.tudelft.nl/~arie/phds/Hemel.pdf) - Zef Hemel (PDF)
 * [Naked objects](http://downloads.nakedobjects.net/resources/Pawson%20thesis.pdf) - Richard Pawson (PDF)
 * [NASA Manager Handbook for Software Development](http://homepages.inf.ed.ac.uk/dts/pm/Papers/nasa-manage.pdf) (PDF)
 * [OAuth - The Big Picture](https://pages.apigee.com/oauth-big-picture-ebook.html)