If your teachers taught you to underline book titles, it probably didn’t make sense to argue.
Plus, underlining is just easier when you’re writing things out by hand.
Not so with texting — or when you’re writing a book of your own.
When you reference your sources, do you underline or italicize book titles?
Are novels italicized or underlined?
And does it matter whether a novel or novelette is part of an anthology?
What are the rules worth remembering?