Cita APA (7a ed.)

Berlin, I., & Hardy, H. (1999). Concepts and categories: Philosophical essays. Princeton University Press.

Cita Chicago Style (17a ed.)

Berlin, Isaiah, y Henry Hardy. Concepts and Categories: Philosophical Essays. Princeton, N.J.: Princeton University Press, 1999.

Cita MLA (9a ed.)

Berlin, Isaiah, y Henry Hardy. Concepts and Categories: Philosophical Essays. Princeton University Press, 1999.