APA

Berlin I. 1., Hardy H. e. & Williams B. A. O. 1. i. (1978). Concepts and categories : philosophical essays / Isaiah Berlin ; ed. by Henry Hardy ; with an introd. by Bernard Williams. London: The Hogarth Press.

Chicago

Berlin Isaiah 1909-1997, Hardy Henry ed and Williams Bernard Arthur Owen 1929-2003 introd. 1978. Concepts and categories : philosophical essays / Isaiah Berlin ; ed. by Henry Hardy ; with an introd. by Bernard Williams. London: The Hogarth Press.

Harvard

Berlin I. 1., Hardy H. e. and Williams B. A. O. 1. i. (1978). Concepts and categories : philosophical essays / Isaiah Berlin ; ed. by Henry Hardy ; with an introd. by Bernard Williams. London: The Hogarth Press.

MLA

Berlin Isaiah 1909-1997, Hardy Henry ed and Williams Bernard Arthur Owen 1929-2003 introd. Concepts and categories : philosophical essays / Isaiah Berlin ; ed. by Henry Hardy ; with an introd. by Bernard Williams. London: The Hogarth Press. 1978.