The enlightenment: an interpretation. 2: The science of freedom.

MLA

Gay, Peter. The Enlightenment: an Interpretation. 2: The Science of Freedom. London, 1979.

APA

Gay, P. (1979). The enlightenment: an interpretation. 2: The science of freedom. London.

Chicago

Gay, Peter The Enlightenment: an Interpretation. 2: The Science of Freedom. London, 1979.