Queen Elizabeth Ii Biography

Question: Anyone know of any good books on Queen Elizabeth II's role to her country?
I am doing a paper for my British Empire class on how the role of Queen is very important to the British people, even though it has little political power. Anyone know of any good books that would discuss that? So far all I'm finding are biographies and tell-all's. Thanks!
Answer: The Tarnished Crown by Anthony Holden
The Diana Chronicles by Tina Brown, page 474,especially.
The official website of the Queen's is http://www.royal.gov.uk and it explains the Queen's role extensively.
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Life & Times of Queen Elizabeth II