Waitley Denis. (1995). Empires of the Mind. Nicholas Brealey.
Cita Chicago (17th ed.)Waitley Denis. Empires of the Mind. London: Nicholas Brealey, 1995.
Cita MLA (9th ed.)Waitley Denis. Empires of the Mind. Nicholas Brealey, 1995.
Atenció: Aquestes cites poden no estar 100% correctes.