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index a61b59c..fc58841 100644
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 ### Sometimes expanded and modified code examples of following books:
 
 ##### 21st century C
-[http://shop.oreilly.com/product/0636920025108.do]()
+[http://shop.oreilly.com/product/0636920025108.do](http://shop.oreilly.com/product/0636920025108.do)
 
 ##### Understanding and Using C Pointers
-[http://shop.oreilly.com/product/0636920028000.do]()
+[http://shop.oreilly.com/product/0636920028000.do](http://shop.oreilly.com/product/0636920028000.do)
 
 ##### jQuery Mobile - Up and Running
-[http://shop.oreilly.com/product/0636920014607.do]()
+[http://shop.oreilly.com/product/0636920014607.do](http://shop.oreilly.com/product/0636920014607.do)
 
 ##### Python 3 Object Orientated Programming
-[https://www.packtpub.com/application-development/python-3-object-oriented-programming]()
+[https://www.packtpub.com/application-development/python-3-object-oriented-programming](https://www.packtpub.com/application-development/python-3-object-oriented-programming)
 
 ##### Test-Driven Development for Embedded C
-[https://pragprog.com/book/jgade/test-driven-development-for-embedded-c]()
+[https://pragprog.com/book/jgade/test-driven-development-for-embedded-c](https://pragprog.com/book/jgade/test-driven-development-for-embedded-c)