Não informado. Publications of the Allegheny Observatory of the University of Pittsburgh. University of Pittsburgh.
Chicagoスタイル(17版)引用形式Não informado. Publications of the Allegheny Observatory of the University of Pittsburgh. Lancaster, Pa: University of Pittsburgh.
MLA(8版)引用形式Não informado. Publications of the Allegheny Observatory of the University of Pittsburgh. University of Pittsburgh.
警告: この引用は必ずしも正確ではありません.