Não informado. (1911). Contributions from the Princeton University Observatory. Princeton University Observatory.
Čikaški stil citiranja (17. izdanje)Não informado. Contributions from the Princeton University Observatory. Princeton, NJ: Princeton University Observatory, 1911.
MLA način citiranja (8. izdanje)Não informado. Contributions from the Princeton University Observatory. Princeton University Observatory, 1911.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.