diff --git a/extras/readings.md b/extras/readings.md
index 274b00b..414d00e 100644
--- a/extras/readings.md
+++ b/extras/readings.md
@@ -79,6 +79,5 @@ Name | Author(s)
 [Bayesian Reasoning and Machine Learning](http://web4.cs.ucl.ac.uk/staff/D.Barber/pmwiki/pmwiki.php?n=Brml.HomePage) | David Barber
 [Language Implementation Patterns](https://www.amazon.com/gp/product/193435645X) | Terence Parr
 [Compilers: Principles, Techniques, and Tools (2nd Edition)](http://www.amazon.com/Compilers-Principles-Techniques-Tools-2nd/dp/0321486811/) | Alfred V. Aho, Monica S. Lam, Ravi Sethi,  Jeffrey D. Ullman
-[Compiler Construction](http://www.ethoberon.ethz.ch/WirthPubl/CBEAll.pdf) | Niklaus Wirth 
 [The Mythical Man-Month](https://www.amazon.com/Mythical-Man-Month-Software-Engineering-Anniversary/dp/0201835959/) | Fred Brooks, Jr.
 [Physically Based Rendering: From Theory To Implementation](http://www.pbr-book.org/) | Matt Pharr, Wenzel Jakob, and Greg Humphreys