I know that the maarufu theory is that August wrote the book, and that makes sense, since he is a writer. However, I get the feeling that the book is one of a kind, not something wewe can buy in a store. That means that he would have had to either deliver au send it to storybrooke. While that is certainly possible, I have some other suspects who I think may have written the book.
1. Rumplestiltskin: He seemed to want the curse broken, and the book would help do that. He is also a master manipulator, so Im sure he would have no problem making sure that the book got into the hands of Henry, who was the best person to find Emma. Finally, he seems to have had contact with everybody, which would make him the ideal person to write their stories.
2. Jefferson: He was stuck in the house for 28 years, so clearly he had plenty of time to write. He probably wanted the curse broken as much au zaidi than anybody, and, with his hats, who knows how many characters he came into contact with?
3. Snow:She is the one who gave the book to Henry after all. She also knew the curse was coming, so she may have written the book as a sort of journal. This would explain why she seems to be. so central in so much of the book. The only problem I have with this is: how did she get it to storybrooke with her?
4. Regina: This seems highly unlikely, I admit. However, it looks like she created their "pasts" in Storybrooke, so she clearly has a gift for storytelling. She also seems to have come into contact with almost as many characters (maybe as many) as Rumplestiltskin, so she would know their stories.