APA (7th ed.) Citation

Locke, J., & Yolton, J. W. (1991). An essay concerning human understanding. Everyman's Library.

Chicago Style (17th ed.) Citation

Locke, John, and John W. Yolton. An Essay Concerning Human Understanding. London: Everyman's Library, 1991.

MLA (9th ed.) Citation

Locke, John, and John W. Yolton. An Essay Concerning Human Understanding. Everyman's Library, 1991.