3.9.1 English-Language Titles
Journal Articles and Parts of Books.
In English-language titles, capitalize only (1) the first letter of the first word, (2) proper names, and (3) abbreviations that are ordinarily capitalized (eg, DNA, EEG, VDRL). Do not enclose article and book chapter titles in quotation marks. However, if a book, book chapter, or article title contains quotation marks in the original, retain them as double quotation marks (unless both double and single quotation marks are used).
Books, Government Bulletins, Documents, and Pamphlets.
In English-language titles, italicize the titles of books, government bulletins, documents, and pamphlets and capitalize the first letter of each major word. Do not capitalize articles, prepositions of 3 or fewer letters, coordinating conjunctions (and, or, for, nor, but, yet), or the to in infinitives (see 2.1.6, Manuscript Preparation, Titles and Subtitles, Capitalization, for exceptions). Do capitalize a 2-letter verb, such as Is.