Semple, E. C. (1968). Influences of geographic environment on the basis of Ratzel's system of anthropo-geography. Russell & Russell.
Chicago Edition CitationSemple, Ellen Churchill. Influences of Geographic Environment on the Basis of Ratzel's System of Anthropo-geography. New York: Russell & Russell, 1968.
MLA Edition CitationSemple, Ellen Churchill. Influences of Geographic Environment on the Basis of Ratzel's System of Anthropo-geography. Russell & Russell, 1968.
Warning: These citations may not always be 100% accurate.