Deutsche Gesellschaft für Geographie. (2014). Educational standards in Geography for the intermediate School Certificate: With sample assignments (3rd. edition.). DGfG.
Citazione stile Chigago Style (17a edizione)Deutsche Gesellschaft für Geographie. Educational Standards in Geography for the Intermediate School Certificate: With Sample Assignments. 3rd. edition. Berlin: DGfG, 2014.
Citatione MLA (9a ed.)Deutsche Gesellschaft für Geographie. Educational Standards in Geography for the Intermediate School Certificate: With Sample Assignments. 3rd. edition. DGfG, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.