Clements, E. H. (1963). Let or hindrance. Hale.
Cita Chicago (17th ed.)Clements, Eileen Helen. Let or Hindrance. London: Hale, 1963.
Cita MLA (8th ed.)Clements, Eileen Helen. Let or Hindrance. Hale, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.