APA استشهاد

Beer, S. H. (1973). Patterns of government: The major political systems of Europe (3rd ed.). Random House.

استشهاد بنمط شيكاغو

Beer, Samuel H. Patterns of Government: The Major Political Systems of Europe. 3rd ed. New York: Random House, 1973.

MLA استشهاد

Beer, Samuel H. Patterns of Government: The Major Political Systems of Europe. 3rd ed. Random House, 1973.