Não informado. Publications of the Lick Observatory. University of California.
Chicago-viite (17. p.)Não informado. Publications of the Lick Observatory. Sacramento: University of California.
MLA-viite (8. p.)Não informado. Publications of the Lick Observatory. University of California.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.