The first word and all other main words of headings, book titles, and the titles of articles and other documents are capitalized. Articles ( a, an, and the), short prepositions ( to, of, from, etc.) and coordinate conjunctions ( and, but, so, for, or, nor, yet) are not capitalized unless they appear as the first word:
"The Causes and Consequences of Social Loafing" Science and the Researcher Quarterly Guidelines for Giving and Receiving Criticism