APA (7th ed.) Citation

Pope-Hennessy, J. W. (1940). An unknown painting by Delacroix.

Chicago Style (17th ed.) Citation

Pope-Hennessy, John Wyndham. An Unknown Painting by Delacroix. 1940.

MLA (9th ed.) Citation

Pope-Hennessy, John Wyndham. An Unknown Painting by Delacroix. 1940.

Warning: These citations may not always be 100% accurate.