Ahh…sorry. I just opened the document, but haven’t started reading yet.
I think you should be okay with this, too. According to Project Gutenberg, Emily of New Moon is also in the public domain. As for whether you could do this with a copyrighted work, I think it’s probably okay since you wouldn’t be reproducing a substantial portion of the work (though something like a poem might be a different story), but generally speaking, the best course of action would be to obtain permission from the copyright owner.