David Herbert Donald was a Pulitzer Prize winning historian of the Civil War, and professor emeritus at Harvard University, best known for his numerous books on Abraham Lincoln.Yahoo News: Lincoln historian David Herbert Donald dies (May 19, 2009)

He died of heart failure while awaiting heart surgery on May 17, 2009.Yahoo News: Lincoln historian David Herbert Donald dies (May 19, 2009)

David Herbert Donald was considered an expert on Abraham Lincoln, and wrote numerous books on Lincoln's life, associates and politics. His most famous Lincoln was published in 1996: both Bill Clinton and Bob Dole claimed to have read it.Yahoo News: Lincoln historian David Herbert Donald dies (May 19, 2009)

He won a Pulitzer Prize in 1960 for Charles Sumner and the Coming of the Civil War, and a second in 1987 for Look Homeward: A Life of Thomas Wolfe.UPI: David Donald, historian of Lincoln, dies (May 19, 2009)

1. New York Times: David Herbert Donald, Writer on Lincoln, Dies at 88 (May 19, 2009)

2. Yahoo News: Lincoln historian David Herbert Donald dies (May 19, 2009)

3. UPI: David Donald, historian of Lincoln, dies (May 19, 2009)

4. IPTV: Abraham Lincoln's Birthday: What Makes A Strong Leader? (February 12, 1996)

5. Simon & Schuster: David Herbert Donald

6. Boston Globe: Why Lincoln died (November 21, 2004)

7. Wikipedia: David Herbert Donald