Cita APA (7a ed.)

Berlin, I. (1939). Karl Marx, his life and environment. Thornton Butterworth.

Cita Chicago Style (17a ed.)

Berlin, Isaiah. Karl Marx, His Life and Environment. London: Thornton Butterworth, 1939.

Cita MLA (9a ed.)

Berlin, Isaiah. Karl Marx, His Life and Environment. Thornton Butterworth, 1939.