Não informado. (1930). Program of activities of the Chicago Academy of Sciences. Chicago Academy of Sciences.
Chicago-Zitierstil (17. Ausg.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago, Ill: Chicago Academy of Sciences, 1930.
MLA-Zitierstil (8. Ausg.)Não informado. Program of Activities of the Chicago Academy of Sciences. Chicago Academy of Sciences, 1930.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.