Bibliomancy is divination using a book, sometimes a bible is used.
The book will be opened at a random page and while keeping your eyes closed you will point at a line or passage in the book.
Moslems use the Quran for this divination. In the Middle Ages the use of Virgil's Aeneid was common in Europe and known as the sortes Virgilianae. In the classical world the sortes Virgilianae and sortes Homerica (using the Iliad and Odyssey) were used.
During the middle ages Virgils Aeneid was popular. Bibliomancy is a type of Stichomancy: "divination from lines". Some sources refer to bibliomancy as a specialized form of stichomancy, often falsely attributing the word root "biblio" to "the Bible", rather than books in general.