What do you think?
Many seem to think August did it(writer+apparent capability to make up a story in the book's style), but I highly doubt it. He was 7 years old when he left the Enchanted Forest and thus would hardly know any of the stories. Also, if he did write it, why didn't he add the story of Pinocchio until later?
I don't believe Gold made it because his memories were scrapped along with everyone else's until Emma came, but the book came before Emma(but possibly not before "Welcome to Storybrooke").
It MAY have been the Dark Curse since we don't really know if the book existed in the 80s or not.
As for the Blue Fairy writing it, NO. She lost her memories.
In my opinion, it's either the Seer(if she's alive), the Dark Curse, the Dragon or Jefferson.