APA (7th ed.) Citation

British Museum & Mack, J. (2001). Masks: The art of the expression. British Museum.

Chicago Style (17th ed.) Citation

British Museum and John Mack. Masks: The Art of the Expression. London: British Museum, 2001.

MLA (9th ed.) Citation

British Museum and John Mack. Masks: The Art of the Expression. British Museum, 2001.