Quick Answer: There is no single rule for capitalization in titles. Follow your target journal. APA title case capitalizes the first word, major words and any word of four or more letters, and lowercases short articles, conjunctions and prepositions.1 Reference lists use sentence case.2,3 Chicago, from its 18th edition, capitalizes prepositions of five or more letters.4 In a random sample of 391 open-access titles, 52.9%…
