Não informado. Publications of the Kapteyn Astronomical Laboratory at Groningen. University of Groningen.
Chicagoスタイル(17版)引用形式Não informado. Publications of the Kapteyn Astronomical Laboratory at Groningen. Groningen, Holanda: University of Groningen.
MLA(8版)引用形式Não informado. Publications of the Kapteyn Astronomical Laboratory at Groningen. University of Groningen.
警告: この引用は必ずしも正確ではありません.