Não informado. (2018). Publications of the Astronomical Institute of the University of Amsterdam. University of Amsterdam, Astronomical Institute.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Publications of the Astronomical Institute of the University of Amsterdam. Amsterdam: University of Amsterdam, Astronomical Institute, 2018.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Publications of the Astronomical Institute of the University of Amsterdam. University of Amsterdam, Astronomical Institute, 2018.
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