Cita APA (7a ed.)
Illinois Geographical Society. Illinois Geographer. Illinois Geographical Society.
Cita Chicago Style (17a ed.)
Illinois Geographical Society. Illinois Geographer. Normal, Ill.: Illinois Geographical Society.
Cita MLA (9a ed.)
Illinois Geographical Society. Illinois Geographer. Illinois Geographical Society.
Precaución: Estas citas no son 100% exactas.