• The big picture: Abraham, Chaos, Gaia, Eros, Fig. 5-2, p. 64
• The wheel: Chaos, Gaia, Eros, Table 13-1, p. 159
• Ancient Egyptian astronomy: Krupp, Archeoastronomy and the Roots of Science, pp. 289-291
• Egyptian zodiacal tops: Lamy, Egyptian Mysteries, p. 71
• Pyramidiots: Gillings, Mathematics in the Time of the Pharoahs, pp. 237-239
• Accuracy of pyramid allignment: Thurston, Early Astronomy, pp. 25-26
• Finding celestial north: Macaulay, Pyramid, pp. 22-23

Revised 14 April 1996.