Bing found these results
Citibank - Wikipedia
Citigroup - Wikipedia
Citigroup Inc. -- Company History
Walter Wriston - Wikipedia
Global Investment Bank and Financial Services | Citi - Citigroup
Citigroup | American Financial Conglomerate | Britannica Money
Presenting: a History of Citi - Business Insider
Citibank - Wikiwand
The "Titanic" of Wall Street: The Citigroup merger 20 years later
Citigroup summary | Britannica