APA (7th ed.) Citation

National Portrait Gallery (Great Britain), Saywell, D., & Simon, J. (2004). Complete illustrated catalogue: National Portrait Gallery, London. National Portrait Gallery : Unicorn Press.

Chicago Style (17th ed.) Citation

National Portrait Gallery (Great Britain), David Saywell, and Jacob Simon. Complete Illustrated Catalogue: National Portrait Gallery, London. London: National Portrait Gallery : Unicorn Press, 2004.

MLA (9th ed.) Citation

National Portrait Gallery (Great Britain), et al. Complete Illustrated Catalogue: National Portrait Gallery, London. National Portrait Gallery : Unicorn Press, 2004.