The font style for a book title can vary depending on the design of the book cover. Some common font styles for book titles include sans serif fonts such as Arial or Helvetica, or serif fonts such as Times New Roman or Garamond. Sometimes, a more decorative or unique font is used for the title of a book, especially if the book is aimed at a specific audience or genre. For example, a book about fashion might use a sleek, modern font, while a book about history might use a more traditional, classic font.