Search in the library catalog for the famous person's name and the word biography, e.g., Abraham Lincoln biography. If you search for the terms as a subject search, the results will all be biographies of Abraham Lincoln.
For memoirs, or writings the famous person wrote about themself, use the term personal narratives. You might also want to look for diaries or correspondence.
19,000 biographies of figures from American History
Biographical information on more than 149,000 modern novelists, poets, playwrights, nonfiction writers, journalists and scriptwriters
Biography Index Past and Present
Index of individuals from antiquity to the present.