Wikipedia is a free,web-based, collaborative, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation.
To Download Wikipedia Pages as PDF book:
1.Click create a book in the print/export section of wikipedia.
2.Now click Start book creator button.
3.Now open any Wikipedia page that you would like to include in your PDF book
4.click the “Add this page to your book” link.
5.Repeat this step until all the pages have been added.
6.After that, click “Show Book” and give a title and press the download button to save your book as a PDF file.