The Guns of August: The Pulitzer Prize-Winning Classic About the Outbreak of World War I
The Assassination of the Archduke: Sarajevo 1914 and the Romance that Changed the World
The Last of the Doughboys: The Forgotten Generation and Their Forgotten World War
A World Undone: The Story of the Great War, 1914 to 1918
Storm of Steel (Penguin Classics Deluxe Edition)
The Last Kaiser: The Life of Wilhelm II
King, Kaiser, Tsar: Three Royal Cousins Who Led the World to War
Yes. Mein Kampf must be included on such a list.
Movies and Documentaries