APA (7th ed.) Citation

Ruskin, J., & Clark, K. M. S. (1967). Ruskin today. Penguin Books.

Chicago Style (17th ed.) Citation

Ruskin, John, and Kenneth McKenzie Sir Clark. Ruskin Today. Middlesex, Harmondsworth: Penguin Books, 1967.

MLA (9th ed.) Citation

Ruskin, John, and Kenneth McKenzie Sir Clark. Ruskin Today. Penguin Books, 1967.