APA

De Grazia A., Alfred De Grazia, .The elements of political science. New York: .

Chicago

De Grazia Alfred, Alfred De Grazia, .The elements of political science. New York: .

Harvard

De Grazia A., Alfred De Grazia, .The elements of political science. New York: .

MLA

De Grazia Alfred, Alfred De Grazia, .New York: . .