Books about Charlotte:
Chambers, James (2007). Charlotte and Leopold. London: Old Street Publishing. ISBN 978-1-905847-23-5.
Holme, Thea (1976). Prinny’s Daughter. A Life of Princess Charlotte of Wales: Hamish Hamilton. ISBN 10: 0241892988 / ISBN 13: 9780241892985
Plowden, Alison (1989). Caroline & Charlotte: the Regent’s wife and daughter, 1795-1821. London: Sidgwick&Jackson. ISBN 0 – 283 – 99489 – 4
Letters of the Princess Charlotte, 1811-1817 edited by Arthur Aspinall. London: Home & Van Thal, 1949
Huish, Robert and Charlotte Augusta Princess of Great Britain (1818). Memoirs of Her late Royal Highness Charlotte Augusta, Princess of Wales. Original edition by T.Kelly and University of Michigan (e-Book available here: http://books.google.pl/books?id=wrE4AAAAMAAJ&printsec=frontcover&dq=inauthor%3A%22Charlotte+Augusta+%28Princess+of+Great+Britain%29%22&source=bl&ots=TgMo3Mcezu&sig=QXLRBm6HcA5WnX5fp96fDAHG2Fg&hl=pl&sa=X&ei=m5BMUMbNPIbUtAbqpIG4CQ&ved=0CDwQ6AEwAg#v=onepage&q&f=false)
If you know any other biographies of Princess Charlotte, please let me know.