APA Style

Poper, K, R. (1973). The open society and its enemies : volume II the high tide of prophecy: Hegel, Marx, and the aftermath (Ed.6th). London: Routledge.

MLA Style

Poper, K., R.. "The open society and its enemies : volume II the high tide of prophecy: Hegel, Marx, and the aftermath". Ed.6th London: Routledge, 1973. Text.