APA (7e ed.) Bronvermelding

Não informado. (1911). Contributions from the Princeton University Observatory. Princeton University Observatory.

Chicago (17e ed.) Bronvermelding

Não informado. Contributions from the Princeton University Observatory. Princeton, NJ: Princeton University Observatory, 1911.

MLA (8e ed.) Bronvermelding

Não informado. Contributions from the Princeton University Observatory. Princeton University Observatory, 1911.

Let op: Deze citaties zijn niet altijd 100% accuraat.