APA (7th ed.) Citation

Berlin, I., Hardy, H., & Williams, B. (1981). Concepts and categories: Philosophical essays. Penguin.

Chicago Style (17th ed.) Citation

Berlin, Isaiah, Henry Hardy, and Bernard Williams. Concepts and Categories: Philosophical Essays. Harmondsworth: Penguin, 1981.

MLA (8th ed.) Citation

Berlin, Isaiah, et al. Concepts and Categories: Philosophical Essays. Penguin, 1981.