Catherine Helen Spence, Susan Magarey, Maryan Beams (2005). “Ever Yours, C.H. Spence: Catherine Helen Spence's An Autobiography (1825-1910), Diary (1894) and Some Correspondence (1894-1910)”, p.49, Wakefield Press
Walter Lippmann, Clinton Rossiter, James Lare (1982). “The Essential Lippmann: A Political Philosophy for Liberal Democracy”, p.154, Harvard University Press