Não informado. (1903). Bulletin of the Lowell Observatory. Lowell Observatory.
Chicago (17e ed.) BronvermeldingNão informado. Bulletin of the Lowell Observatory. Flagstaff, Ariz: Lowell Observatory, 1903.
MLA (8e ed.) BronvermeldingNão informado. Bulletin of the Lowell Observatory. Lowell Observatory, 1903.
Let op: Deze citaties zijn niet altijd 100% accuraat.