Convention dictates some answers, but the reasons for conventional answers are usually arbitrary.
The primary style books are listed below, but there are others. The alphabetical division is easier for answering specific questions, while the generic division is easier to browse through and learn general principles. Here are the kinds of words that would require you to check the publication style book. This includes titles of books, magazines, newspapers, art works, photographs, movies, plays, poetry, television programs, record albums as well as cassettes and compact disks. Titles also include headlines, sometimes called titles at magazines.