Good Read Harry Potter And The Prisoner Of Azkaban Harry Potter : Year Three At Hogwarts by J.K. Rowling Copyright Year: 1999 ISBN-13: 9780439136365 Video Preview Available format(s): VOICEText (H) 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.