Cita APA (7a ed.)

Ryan, A., & Cohen, G. A. (1979). The Idea of freedom: Essays in honour of Isaiah Berlin. Oxford University Press.

Cita Chicago Style (17a ed.)

Ryan, Alan, y G. A. Cohen. The Idea of Freedom: Essays in Honour of Isaiah Berlin. Oxford [etc.]: Oxford University Press, 1979.

Cita MLA (9a ed.)

Ryan, Alan, y G. A. Cohen. The Idea of Freedom: Essays in Honour of Isaiah Berlin. Oxford University Press, 1979.