APA (7th ed.) Citation

Butler, S., Hill, B., & Keynes, G. (1951). Notebooks of (Samuel Butler). Cape.

Chicago Style (17th ed.) Citation

Butler, Samuel, Brian Hill, and Geoffrey Keynes. Notebooks of (Samuel Butler). Lond.: Cape, 1951.

MLA (8th ed.) Citation

Butler, Samuel, et al. Notebooks of (Samuel Butler). Cape, 1951.