APA (7th ed.) Citation

Semple, E. C. (1968). Influences of geographic environment: On the basis of Ratzel's system of anthropo-geography. Russel & Russel.

Chicago Style (17th ed.) Citation

Semple, Ellen C. Influences of Geographic Environment: On the Basis of Ratzel's System of Anthropo-geography. New York: Russel & Russel, 1968.

MLA (9th ed.) Citation

Semple, Ellen C. Influences of Geographic Environment: On the Basis of Ratzel's System of Anthropo-geography. Russel & Russel, 1968.