Alex Douglas, "Fibonacci: The man & the markets," Standard & Poor's Economic Research Paper, February 20, 2001, pp. 8–10. PDF document hereArchived 2007-02-26 at the Wayback Machine
Roy Batchelor and Richard Ramyar, "Magic numbers in the Dow," 25th International Symposium on Forecasting, 2005, p. 13, 31. PDF document hereArchived 2009-09-18 at the Wayback Machine
Alex Douglas, "Fibonacci: The man & the markets," Standard & Poor's Economic Research Paper, February 20, 2001, pp. 8–10. PDF document hereArchived 2007-02-26 at the Wayback Machine
Roy Batchelor and Richard Ramyar, "Magic numbers in the Dow," 25th International Symposium on Forecasting, 2005, p. 13, 31. PDF document hereArchived 2009-09-18 at the Wayback Machine