Não informado. (1877). Observatory: A monthly review of astronomy. Royal Greenwich Observatory.
Chicagoスタイル(17版)引用形式Não informado. Observatory: A Monthly Review of Astronomy. Sussex, Inglaterra: Royal Greenwich Observatory, 1877.
MLA(8版)引用形式Não informado. Observatory: A Monthly Review of Astronomy. Royal Greenwich Observatory, 1877.
警告: この引用は必ずしも正確ではありません.