code: def get_item_with_href(self, href):
          
          for item in self.get_items():
              if item.get_name() == href:
                  return item
  
          return None
docs: Returns item for defined HREF.
  
          >>> book.get_item_with_href('EPUB/document.xhtml')
  
          :Args:
            - href: HREF for the item we are searching for
  
          :Returns:
            Returns item object. Returns None if nothing was found.