Siedelmann P.K.; Abalakin V.K.; Bursa, M.; Davies, M.E.; et al. (2000). The Planets and Satellites 2000 (Report). IAU/IAG Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites. Archived from the original on 12 May 2020. Retrieved 31 August 2008.
Siedelmann P.K.; Abalakin V.K.; Bursa, M.; Davies, M.E.; et al. (2000). The Planets and Satellites 2000 (Report). IAU/IAG Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites. Archived from the original on 12 May 2020. Retrieved 31 August 2008.