APA (7th ed.) Citation

Cotman, J. S., Holme, G., & Oppé, A. P. (1923). The water-colour drawings of John Sell Cotman. The Studio.

Chicago Style (17th ed.) Citation

Cotman, John Sell, Geoffrey Holme, and A. P. Oppé. The Water-colour Drawings of John Sell Cotman. London: The Studio, 1923.

MLA (8th ed.) Citation

Cotman, John Sell, et al. The Water-colour Drawings of John Sell Cotman. The Studio, 1923.