APA (7th ed.) Citation

Muir, R. (2005). The world's most photographed. National Portrait Gallery.

Chicago Style (17th ed.) Citation

Muir, Robin. The World's Most Photographed. London: National Portrait Gallery, 2005.

MLA (9th ed.) Citation

Muir, Robin. The World's Most Photographed. National Portrait Gallery, 2005.

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