Não informado. (2018). Publications of the Astronomical Institute of the University of Amsterdam. University of Amsterdam, Astronomical Institute.
Chicago-referens (17:e uppl.)Não informado. Publications of the Astronomical Institute of the University of Amsterdam. Amsterdam: University of Amsterdam, Astronomical Institute, 2018.
MLA-referens (8:e uppl.)Não informado. Publications of the Astronomical Institute of the University of Amsterdam. University of Amsterdam, Astronomical Institute, 2018.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.