Cita APA (7a ed.)

Proudhon, P., & Vernon, R. (1979). The principle of federation. University of Toronto Press.

Cita Chicago Style (17a ed.)

Proudhon, Pierre-Joseph, y Richard Vernon. The Principle of Federation. Toronto ; Buffalo ; London: University of Toronto Press, 1979.

Cita MLA (9a ed.)

Proudhon, Pierre-Joseph, y Richard Vernon. The Principle of Federation. University of Toronto Press, 1979.