APA (7th ed.) Citation

National Portrait Gallery London. (1977). Royal faces : 900 years of British monachy: 900 years of British monachy. HMSO.

Chicago Style (17th ed.) Citation

National Portrait Gallery London. Royal Faces : 900 Years of British Monachy: 900 Years of British Monachy. London: HMSO, 1977.

MLA (9th ed.) Citation

National Portrait Gallery London. Royal Faces : 900 Years of British Monachy: 900 Years of British Monachy. HMSO, 1977.

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