Tham khảo Đỉnh điểm (thiên văn học)

  1. 1 2 Bakich, Michael E. (1995). The Cambridge Guide to the Constellations. Cambridge University Press. tr. 8. ISBN 0521449219.
  2. 1 2 Daintith, John; Gould, William (2009). “Culmination”. The Facts on File Dictionary of Astronomy. Infobase Publishing. tr. 110. ISBN 1438109326.
  3. ↑ Mackenzie, William (1879–1881). “Meridian”. The National Encyclopaedia. 8 . London, Edinburgh, and Glasgow: Ludgate Hill, E.C. tr. 993.