- (1985) Book: "Poor Little Rich Girl : The Life and Legend of Barbara Hutton". London: Hutchinson. ISBN-10: 0091460107; ISBN-13: 9780091460105
- (1995) Book: "Liz: An Intimate Biography of Elizabeth Taylor". New York: Citadel Press. ISBN-10: 1559722673; ISBN-13: 9781559722674
- (2013) Book: "Joe and Marilyn". New York: Atria/Emily Bestler Books. ISBN-10: 1439191778; ISBN-13: 9781439191774
- (2009) Book: "Bobby and Jackie: A Love Story". New York: Atria. ISBN-10: 1416556249
- (2007) Book: "American Legacy: The Story of John & Caroline Kennedy". New York: Atria. ISBN-10: 0743497384
- (2003) Book: "The Georgetown Ladies' Social Club: Power, Passion, and Politics in the Nation's Capital". New York: Atria. ISBN-10: 0743428560; ISBN-13: 9780743428569
- (1998) Book: "RFK: A Candid Biography of Robert F. Kennedy". New York: Dutton Adult. ISBN-10: 0525942173; ISBN-13: 9780525942177
- (1989) Book: "Woman Named Jackie". London: William Heinemann Ltd. ISBN-10: 0434897698; ISBN-13: 9780434897698
- (1980) Book: "American Aristocracy: The Lives & Times of James Russell, Amy & Robert Lowell". New York: Dodd Mead. ISBN-10: 0396076084; ISBN-13: 9780396076087
- (1976) Book: "Ezra Pound: The Last Rower". New York: Viking Adult. ISBN-10: 0670303917; ISBN-13: 9780670303915
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