Oscar Wilde and the Black Douglas,
by the Marquess of Queensberry in collaboration with Percy Colson.

APA Citation

Queensberry, F. Archibald Kelhead Douglas. (1950). Oscar Wilde and the Black Douglas. London: Hutchinson.

MLA Citation

Queensberry, Francis Archibald Kelhead Douglas, Marquess of, 1896-1954. Oscar Wilde And the Black Douglas. London: Hutchinson, 1950.

Warning: These citations may not always be complete (especially for serials).