N. Scott Arnold, Imposing values: an essay on liberalism and regulation, Florence, Oxford University Press, 2009, p. 3, ISBN 978-0-495-50112-1.
«Modern liberalism occupies the left-of-center in the traditional political spectrum and is represented by the Democratic Party in the United States, the Labor Party in the United Kingdom, and the mainstream Left (including some nominally socialist parties) in other advanced democratic societies.»