Não informado. (2008). Royal Observatory annals. Royal Greenwich Observatory.
Chicagoスタイル(17版)引用形式Não informado. Royal Observatory Annals. Sussex, Inglaterra: Royal Greenwich Observatory, 2008.
MLA(8版)引用形式Não informado. Royal Observatory Annals. Royal Greenwich Observatory, 2008.
警告: この引用は必ずしも正確ではありません.