Do you capitalize the word "in" or "on" in book titles?

Question

For example, if there was a book called "He Is in the Park", would you capitalize the word "in"?

Thanks,
Leo

Answer 1

Not usually. See Rule 8:
http://www.grammarbook.com/punctuation/capital.asp

Answer 2

No, you would not. Just as you don't capitalize the of in United States of America