Rujukan

Hanbury Brown, R. 1978 "Man and the Stars", Oxford University Press London.

Katsir, A. 1979 "Matahari dan Bulan Dengan Hisab", Pt. Bina Ilmu, Surabaya.

"Explanatory Supplement to the Astronomical Ephemeris" 1961 Her Majesty's Stationery Office, London.