Não informado. (2012). Publications of the Yerkes Observatory. University of Chicago Press.
Chicago-referens (17:e uppl.)Não informado. Publications of the Yerkes Observatory. Chicago, Ill: University of Chicago Press, 2012.
MLA-referens (8:e uppl.)Não informado. Publications of the Yerkes Observatory. University of Chicago Press, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.