Barrett, D. V. (1992). The encyclopedia of prediction. Acropolis Books.
Cita Chicago (17th ed.)Barrett, David V. The Encyclopedia of Prediction. Leicestershire, UK: Acropolis Books, 1992.
Cita MLA (9th ed.)Barrett, David V. The Encyclopedia of Prediction. Acropolis Books, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.