Killing Lincoln: The Shocking Assassination That Changed America Forever is a historical non-fiction book by Bill O'Reilly and Martin Dugard that recounts the events leading up to and following the assassination of President Abraham Lincoln in 1865.
It is likely that the font utilized for the book's title and author names on the cover is Clarendon Extra Condensed Demi Bold, which is designed by Wooden Type Fonts. Further information regarding the font is available here.