APA (7th ed.) Citation

Valsecchi, M., & O'Sullivan, F. (1963). National Gallery, London. Oldbourne Press.

Chicago Style (17th ed.) Citation

Valsecchi, Marco, and Firmin O'Sullivan. National Gallery, London. London: Oldbourne Press, 1963.

MLA (9th ed.) Citation

Valsecchi, Marco, and Firmin O'Sullivan. National Gallery, London. Oldbourne Press, 1963.