English - England
"This is an extract of the book War and Peace," is what I would have always said, but recently I was told it should be " an extract from". Can anyone give me a definitive answer to this?
But "extract" is not being used as a verb, but as a noun, here. Sure, "from" works in both cases, but you would hardly say "This is an extract out of a book."You can extract some text from a book.
You can extract some text out of a book.
You cannot extract some text of a book.
So "from" is correct, and "of" is wrong.
You use "of" in "part of", but not "extract of".