Não informado. (1855). Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory.
Chicago-Zitierstil (17. Ausg.)Não informado. Annals of the Astronomical Observatory of Harvard College. Cambridge, Mass: Harvard College Observatory, 1855.
MLA-Zitierstil (8. Ausg.)Não informado. Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory, 1855.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.