Where can one find a textbook about introduction to algorithms?

* Introduction to Algorithms, Third Edition by Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein [Available on: Amazon](https://www.amazon.com/Introduction-Algorithms-3rd-Thomas-Cormen/dp/0262033844) [Free online version](http://algorithmics.lsi.upc.edu/~eal/docs/intro.pdf)

* The Algorithm Design Manual, Second Edition by Steven S. Skiena [Available on: Amazon](https://www.amazon.com/Algorithm-Design-Manual-Steven-Skiena/dp/1849967202) [Free online version](http://algorithmic.zone/books/Skiena-Algo/)

* Algorithms, Fourth Edition by Robert Sedgewick and Kevin Wayne [Available on: Amazon](https://www.amazon.com/Algorithms-4th-Robert-Sedgewick-Wayne/dp/0321573519) [Free online version](http://algs4.cs.princeton.edu/home/)

* Algorithmics: The Spirit of Computing, Third Edition by David Harel and Yossi Matias [Available on: Amazon](https://www.amazon.com/Algorithmics-Spirit-Computing-David-Harel/dp/9811066500) [Free online version is not known]

* Data Structures and Algorithm Analysis in Java, Third Edition by Mark Allen Weiss [Available on: Amazon](https://www.amazon.com/Data-Structures-Algorithms-Analysis-3rd/dp/0132370442) [Free online version is not known]