Ritz, César in "Dizionario di Economia e Finanza" - Treccani - Treccani
Thames College - Sri Lanka - César Ritz (23 February 1850 – 24 October 1918) was a Swiss hotelier and founder of several hotels, most famously the Hôtel Ritz in Paris and
Cesar Ritz: El pionero de la hotelería de lujo moderna - Hotevia | por Javier Baz
Cesar Ritz Life and Work : Adalbert Chastonay: Amazon.it: Libri
César Ritz: Hotelier to the stars - CooksInfo
King of hotel-keepers put name to luxury
César Ritz | Hotelier, Entrepreneur, Innovator | Britannica