APA

Beer Samuel H, Ulam Adam B, . (1963). Patterns of government : The major political systems of Europe. New York: Random House.

Chicago

Beer Samuel H, Ulam Adam B, . 1963. Patterns of government : The major political systems of Europe. New York: Random House.

Harvard

Beer Samuel H, Ulam Adam B, . (1963). Patterns of government : The major political systems of Europe. New York: Random House.

MLA

Beer Samuel H, Ulam Adam B, . Patterns of government : The major political systems of Europe. New York: Random House. 1963.