books & Research
كتب & أبحاث
http://www.online-literature.com/author_index.php
http://www.gutenberg.org/wiki/Main_Page
http://en.childrenslibrary.org/
https://archive.org/details/texts
http://worldpubliclibrary.org/
https://www.questia.com/library/free-books
https://en.wikisource.org/wiki/Main_Page
https://en.wikibooks.org/wiki/Main_Page
http://digital.library.upenn.edu/books/
https://books.google.com/?hl=en
http://www.free-ebook-download.net/