diff --git a/sources/tech/20170823 How Machines Learn A Practical Guide.md b/sources/tech/20170823 How Machines Learn A Practical Guide.md
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+translating by Flowsnow
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 How Machines Learn: A Practical Guide
 ============================================================
 
@@ -338,7 +340,7 @@ via: https://medium.freecodecamp.org/how-machines-learn-a-practical-guide-203aae
 [35]:https://www.coursera.org/learn/practical-machine-learning
 [36]:https://github.com/rasbt/python-machine-learning-book
 [37]:https://github.com/rasbt/deep-learning-book
-[38]:https://books.google.be/books/about/Machine_Learning_with_R.html?id=ZQu8AQAAQBAJ&source=kp_cover&redir_esc=y
+[38]:https://books.google.be/books/about/Machine_Learning_with_R.html?id=ZQu8AQAAQBAJ&source=kp_cover&redir_esc=y
 [39]:http://www.kaggle.com/
 [40]:https://www.datacamp.com/community/open-courses/kaggle-python-tutorial-on-machine-learning
 [41]:https://www.datacamp.com/community/open-courses/kaggle-tutorial-on-machine-learing-the-sinking-of-the-titanic