Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993.
PROPER NOUNS, PROPER NAMES
Proper nouns are in fact proper names: Cleveland, Mississippi, Frederick S. Smith, Boeing, Second Congregational Church, Palace Theater, Memorial Stadium. These are the names of specific persons, places, organizations, and the like, and American English conventionally capitalizes the first letter of each word in a name other than conjunctions, prepositions, and articles: the House of Representatives, the Army of the United States, the Fourth of July, the Treaty of Versailles. In titles of works, the initial article is also capitalized: The Toronto Globe and Mail, The Naked and the Dead, A Man for All Seasons.
