Não informado. (1911). Contributions from the Princeton University Observatory. Princeton University Observatory.
Style de citation Chicago (17e éd.)Não informado. Contributions from the Princeton University Observatory. Princeton, NJ: Princeton University Observatory, 1911.
Style de citation MLA (8e éd.)Não informado. Contributions from the Princeton University Observatory. Princeton University Observatory, 1911.
Attention : ces citations peuvent ne pas être correctes à 100%.