APA

Aptheker H., . (1967). The nature of democracy, freedom, and revolution. New York: International Publishers.

Chicago

Aptheker Herbert, . 1967. The nature of democracy, freedom, and revolution. New York: International Publishers.

Harvard

Aptheker H., . (1967). The nature of democracy, freedom, and revolution. New York: International Publishers.

MLA

Aptheker Herbert, . The nature of democracy, freedom, and revolution. New York: International Publishers. 1967.