APA (7th ed.) Citation

Mackay, W., & Roberts, W. (1909). John Hoppner, R. A. Colnaghi [u.a.].

Chicago Style (17th ed.) Citation

Mackay, William, and William Roberts. John Hoppner, R. A. London: Colnaghi [u.a.], 1909.

MLA (9th ed.) Citation

Mackay, William, and William Roberts. John Hoppner, R. A. Colnaghi [u.a.], 1909.