Cita APA (7th ed.)
Barrett, W. E. (1972). The shape of illusion. Doubleday & Co.
Cita Chicago (17th ed.)
Barrett, William E. The Shape of Illusion. New York: Doubleday & Co, 1972.
Cita MLA (9th ed.)
Barrett, William E. The Shape of Illusion. Doubleday & Co, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.