Não informado. (1898). Bulletin of the Astronomical Observatory of Harvard University. Astronomical Observatory of Harvard University.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the Astronomical Observatory of Harvard University. Cambridge, Mass: Astronomical Observatory of Harvard University, 1898.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the Astronomical Observatory of Harvard University. Astronomical Observatory of Harvard University, 1898.
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