Hello friends wikipedia recently introduced one new feature by which you can make wikipedia articles in the form of pdf e-book format.
Steps to make your own e-book:
1> create your account on wikipedia
2> go here- book creator
3> search wich articles u want to add
4>Click on "ADD THIS PAGE TO YOUR BOOK" green button from top.
5>After adding all requird articles click on "SHOW BOOK" butto from top
6>Give title name and start downloading.