Capitalize the first element of every compound word. For example, "Use Your Elephant-Gun Ammunition Wisely."
Capitalize the second element and any following element of a compound word unless that element is an article, a preposition or a coordinating conjunction (for, nor, or, and, but). For example, "The Unforgettable-but-Inimical Comedy of Buster Tight Shoes."
Capitalize the second element of a spelled-out number. For example, "Sunday Sees Twenty-Third Anniversary of the Storming of the Bastille."
Do not capitalize the second or following element of a compound word if the element is the word "sharp" or the word "flat" following a musical key symbol. For example, "Analysis of Mozart's Concerto for Two Pianos in E-flat."
Do not capitalize an element following a prefix if the prefix is not a word and the element is not a proper noun or proper adjective. For example, "Anti-clerical Riots Commonplace in Tangier" but "Anti-Swiss Sentiment Common among Martians."