General (text):

Rene Albrecht-Carrie, The Meaning of the First World War

Cyril Falls, The Great War

B. H. Liddell Hart, History of the First World War

Paul Fussell, The Great War and Modern Memory

James Stokesbury, A Short History of World War I

 

General (illustrated):

U.S. Official Pictures of the World War (1920)

Lawrence Stallings, The First World War:  A Photographic History

S. L. A. Marshal, The American Heritage History of World War I

Hew Strachan, The Oxford Illustrated History of the First World War

Ross Burns (editor), The World War I Album

Background:

Lawrence Lafore, The Long Fuse

Robert Massie, Dreadnought:  Britain, Germany, and the Coming of the Great War

Barbara Tuchman, The Proud Tower

Outbreak:

Dwight Lee (editor), The Outbreak of the First World War:  Who Was Responsible?

Barbara Tuchman, The Guns of August

Document Collections:

George Panichas, Promises of Greatness:  The War of 1914-1918

Louis Snyder (editor), Historic Documents of World War I

Peter Vansittart, Voices from the Great War

Memoirs:

Vera Britton, Testament of Youth

Robert Graves, Goodbye to All That

John Reed, Ten Days That Shook the World

Battles:

John Keegan, The Face of Battle (chapter 4:  The Somme, pp. 204-84)

Diplomacy and Spying:

Barbara Tuchman, The Zimmermann Telegram

New Technologies (Airplanes, Submarines, Tanks):

William Dooly, Jr., Great Weapons of World War I

Christopher Campbell, Aces and Aircraft of World War I

Jane's Fighting Aircraft of World War I

Eric Morris, Tanks (Modern Military Series) 

Quentin Reynolds, They Fought for the Sky

B. T. White, Tanks and other Armoured Fighting Vehicles 1900-1918

The Press:

Philip Knightley, The First Casualty:  From the Crimea to Vietnam:  The War Correspondent as Hero, Propagandist, and Myth Maker

Arto DeMirjian, Jr. and Eve Nelson (editors), Front Page History of the World Wars as reported by the New York Times

The Russian Revolution:

John Shelton Curtiss, The Russian Revolutions of 1917

Theodore H. Von Laue, Why Lenin?  Why Stalin?  A Reappraisal of the Russian Revolution, 1900-1930

Edmund Wilson,  To the Finland Station

The Treaty of Versailles:

Ivo Lederer (editor), The Versailles Settlement:  Was it Fordoomed to Failure?

Harold Nicolson, Peacemaking 1919

John Maynard Keynes, The Economic Consequences of the Peace

Etienne Mantoux, The Carthaginian Peace

Literature (Novels, Poetry, etc.):

Erich Maria Remarque, All Quiet on the Western Front

Humphrey Cobb, Paths of Glory

C. S. Forester, The General

Upton Sinclair, World's End

Philip McCutcheon, The Last Farewell 

The Penguin Book of First World War Poetry, ed. Jon Silkin

Women and the War

Lines of Fire:  Women Writers of World War I, edit. Margaret R. Higonnet