J.K. Rowling is penning a `` Harry Potter '' encyclopedia . Rowling : ` I have been writing for over 20 years and this will be my first book to write in the style of an encyclopedia.
J.K. Rowling is penning a `` Harry Potter '' encyclopedia . Rowling : `` I have been promising an encyclopedia of Harry 's world , and I have started work on this now '' Potter fans have been waiting for years for Rowling to revisit the magical world she created .