War and peace and war
War and peace and war: the life cycles of imperial nations Peter Turchin,
Publisher: New York : Pi Press, c2006.
ISBN: 0131499963
DDC: 909
LCC: D20
Journey Across Time
Journey Across Time: Early Ages, Teachers Wraparound Edition
Publisher: Glencoe/Mcgraw-Hill
ISBN: 0078603161
DDC: 909
Edition: Hardcover; 2005-01-02