Every book must have a Title Leaf and a Verso.
Title Leaf: The more common name for Title Leaf is Title Page. It must list the Title of the book and the subtitle; other information such as the author and publisher can appear, but only the title and subtitle are required.
Verso: The more common name for the Verso is the Copyright page. This is the page on the obverse (thus ‘verso’) or back of the Title Leaf.