Não informado. (1855). Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annals of the Astronomical Observatory of Harvard College. Cambridge, Mass: Harvard College Observatory, 1855.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annals of the Astronomical Observatory of Harvard College. Harvard College Observatory, 1855.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.