diff --git a/README.md b/README.md
index 65524ae..f8b2155 100644
--- a/README.md
+++ b/README.md
@@ -166,7 +166,7 @@ A curated list of awesome mathematics resources.
 
 ### Logic
 
-* [Introduction to Logic](http://logic.stanford.edu/intrologic/secondary/index.html) - Michael Genesereth, Eric Kao (Stanford University)
+* [Introduction to Logic](https://pdfs.semanticscholar.org/6967/f52773d9c2ccfc94658657a5761e0f00e95a.pdf) - Michael Genesereth, Eric Kao (Stanford University)
 * [An Introduction to Formal Logic](https://www.fecundity.com/codex/forallx.pdf) - P.D. Magnus (University at Albany)
 * [A Problem Course in Mathematical Logic](http://euclid.trentu.ca/math/sb/pcml/pcml-16.pdf) - Stefan Bilaniuk (Trent University)
 * [Language, Proof, and Logic](http://homepages.uc.edu/~martinj/Symbolic_Logic/341%20Syllabus,%20Textbook,%20Handouts,%20Notes/LPL%20textbook.pdf) - Jon Barwise, John Etchemendy