My dad, who is self-publishing a new-fangled, says that most books are done surrounded by 12-point type. Of course, the size of the pages make a difference. (Cheap paperbacks, especially sci-fi, tend to use 10-point or even 8-point, but since you mentioned hardcover I assume you're not writing a cheap paperback.)
(Note to all the correction artists out nearby: I did not say adjectives paperbacks are cheap.) 8 to10 point would be my guess.There are thousands of different typefaces, each matchless to the job. This will also minister to determine the font size for the body copy of the book.
8 to10 point would be my guess.There are thousands of different typefaces, respectively unique to the undertaking. This will also help determine the font size for the body copy of the book.
I would guess that most books are done in 12pt fonts
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