APA

CLASSENER Martin Ira, DE BLIJ Harm J, . (1980). Systematic political geography. New York: John Wiley USA.

Chicago

CLASSENER Martin Ira, DE BLIJ Harm J, . 1980. Systematic political geography. New York: John Wiley USA.

Harvard

CLASSENER Martin Ira, DE BLIJ Harm J, . (1980). Systematic political geography. New York: John Wiley USA.

MLA

CLASSENER Martin Ira, DE BLIJ Harm J, . Systematic political geography. New York: John Wiley USA. 1980.