APA

Boehm R.G A. D., . (2002). Geography the world and its people. New York: .

Chicago

Boehm R.G Armstrong D.G, . 2002. Geography the world and its people. New York: .

Harvard

Boehm R.G A. D., . (2002). Geography the world and its people. New York: .

MLA

Boehm R.G Armstrong D.G, . Geography the world and its people. New York: . 2002.