Links[1] https://www.bookweb.org/downloads/genre-specific-used-books [2] https://www.bookweb.org/system/files/diy/As_Good_As_New_-_Used_booksWi6_2.pdf [3] https://www.bookweb.org/system/files/diy/Green_Apple_Bookson_Used_Books_Wi6_2_0.pdf