diff --git a/speech_recognition/README.md b/speech_recognition/README.md
index 3676ea3..5844169 100644
--- a/speech_recognition/README.md
+++ b/speech_recognition/README.md
@@ -2,8 +2,8 @@
 
 ## External Papers
 
-[A tutorial on hidden Markov models and selected applications in speech recognition](http://people.sabanciuniv.edu/~berrin/cs512/reading/rabiner-tutorial-on-hmm.pdf)
+[A tutorial on hidden Markov models and selected applications in speech recognition](http://luthuli.cs.uiuc.edu/~daf/courses/Signals%20AI/Papers/HMMs/0.pdf)
 
 [Weighted Finite-State Transducers in Speech Recognition](http://www.cs.nyu.edu/~mohri/pub/csl01.pdf)
 
-[Decoding speech in the presence of other sources](http://www.ee.columbia.edu/~dpwe/pubs/BarkCE05-sfd-spcomm.pdf)
\ No newline at end of file
+[Decoding speech in the presence of other sources](http://www.ee.columbia.edu/~dpwe/pubs/BarkCE05-sfd-spcomm.pdf)