Normans in the South, 1016-1130. The Normans in Sicily Volume I, Paperback/John Julius Norwich

Secret Service: Hidden Systems That Deliver Unforgettable Customer Service, Paperback/John R. Dijulius

A Short History of Byzantium, Paperback/John Julius Norwich

The Customer Service Revolution: Overthrow Conventional Business, Inspire Employees, and Change the World - John R. Dijulius

Four Princes: Henry VIII, Francis I, Charles V, Suleiman the Magnificent and the Obsessions that Forged Modern Europe | John Julius Norwich

The Relationship Economy: Building Stronger Customer Connections in the Digital Age, Hardcover/John R. Dijulius