How can I remove stickers on new open bookshelves?

We purchased a new set of open wood bookshelves from our local furniture store. There are large stickers stuck tightly on the inside. I need to remove them, but they are not coming off with just a finger loosening. I don't want to use harsh chemicals on them, because I don't want to ruin them. How can I get them off without scratching or damaging the real wood?

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