Helen Keller Signet Classics Ser. by Helen Keller; Jim Knipfel (Introduction by) Copyright Year: 2002 ISBN-13: 9780606239974 Available format(s): Classic Audio Log in to read 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.