Indefinite pronouns are weird. They told us in school, you could memorize all the singular ones. But why bother? Just memorize the four that are plural: both, few, many and several. All the rest (anybody, everyone) are singular. Also in the 8th grade, they told us the way titles are written, underlining or in quote marks, can be complicated. And there is more than one system. So why not just use the simplest system? Titles of books are always underlined. Every other title is in quote marks.