Não informado. (1930). Program of activities of the Chicago Academy of Sciences. Chicago Academy of Sciences.
Chicago-referens (17:e uppl.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago, Ill: Chicago Academy of Sciences, 1930.
MLA-referens (8:e uppl.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago Academy of Sciences, 1930.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.