Não informado. Rensselaer Observatory Publications. Rensselaer Polytechnic Institute.
Chicago (17e ed.) BronvermeldingNão informado. Rensselaer Observatory Publications. Troy, NY: Rensselaer Polytechnic Institute.
MLA (8e ed.) BronvermeldingNão informado. Rensselaer Observatory Publications. Rensselaer Polytechnic Institute.
Let op: Deze citaties zijn niet altijd 100% accuraat.