MLA

Popper, Karl. The Open Society and Its Enemies: Volume Ii: Hegel and Marx. New York: Routledge, 1995.

APA

Popper, K. (1995). The open society and its enemies: Volume II: Hegel and Marx. New York: Routledge.

Chicago

Popper, Karl The Open Society and Its Enemies: Volume II: Hegel and Marx. New York: Routledge, 1995.