def add(*arguments)
      Element.parse(arguments.flatten, @options).each do |element|
        data << element.added_to_bibliography(self)
      end
      self
    end
def add(*arguments)
      Element.parse(arguments.flatten, @options).each do |element|
        data << element.added_to_bibliography(self)
      end
      self
    end
Adds a new element, or a list of new elements to the bibliography.
 Returns the Bibliography for chainability.