APA
Isaiah Bowman, . (1921). The New World : problems in political geography. New York: World Book Company.
Chicago
Isaiah Bowman, . 1921. The New World : problems in political geography. New York: World Book Company.
Harvard
Isaiah Bowman, . (1921). The New World : problems in political geography. New York: World Book Company.
MLA
Isaiah Bowman, . The New World : problems in political geography. New York: World Book Company. 1921.
