1. Lewis Boss , Preliminary general catalogue of 6188 stars for the epoch 1900, Washington1910 .
2. Tycho Brahe, and I. L. E. Dreyer , Opera omnia, 15 vols., Hauniae 1913-1929.
3. Chhuthan Hsi-Ta , Khai-Yuan Chan Ching(The Khai-Yuan reign-period Treatise on Astrology and Astronomy), 729 .
4. Jean Delambre, and Baptiste Joseph , Histoire de l'astronomie ancienne, 2 vols, Paris1817 .