Παραπομπή σε μορφή APA (7η εκδ.)

Semple, E. C., & Ratzel, F. (1911). Influences of geographic environment, on the basis of Ratzel's system of anthropo-geography. H. Holt and Co..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Semple, Ellen Churchill, και Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. New York: H. Holt and Co., 1911.

Παραπομπή σε μορφή MLA (8th εκδ.)

Semple, Ellen Churchill, και Friedrich Ratzel. Influences of Geographic Environment, on the Basis of Ratzel's System of Anthropo-geography. H. Holt and Co., 1911.