• Dictionary of American History    E174.D52
• Oxford Companion to American History E174.J6
• The Annals of America     E173.A793
• American Decades    E169.12.A419
• Encyclopedia of the Second World War   D847.K82
• Encyclopedia of Britain   DA27.5 G37
• Encyclopedia of World Cultures   GN307.E53
• Dictionary of the Middle Ages   D114.D5

• Facts on File (including Yearbooks)   D410.F32
• Smithsonian Timelines of the Ancient World   D54.5  S65
• Editorials on File   D839.E3
• Annual Register of World Events  D2.A7
• Chronicle of the 20th Century   CB422.C53
• Events: A Chronicle of the 20th Century   CB425.E85

Other Sources:

• Cambridge Medieval History   D117.C3
• World War II   D299.H512

Indexes:

• Facts on File Index
• American History and Life
• Modern Historical Abstracts