Ruth and the Green Book Carolrhoda Picture Bks by Calvin A. Ramsey; Floyd Cooper (Illustrator) Copyright Year: 2010 ISBN-13: 9780761352556 Available format(s): Classic Audio Add to Bookshelf What's an Audio Format Audio format refers to the way an audiobook is recorded. Not all audiobooks have the same formats. Classic Audio: A human reading an audiobook without the text displayed. VOICEtext (H): Human narrator with text that you can follow along with as it reads. VOICEtext (S): Synthetic voice with text you can follow along with as it reads.