APA (7th ed.) Citation

Bomford, D., Dunkerton, J., & Wyld, M. (2009). A closer look: Conservation of paintings (Rev. and expanded ed.). National Gallery.

Chicago Style (17th ed.) Citation

Bomford, David, Jill Dunkerton, and Martin Wyld. A Closer Look: Conservation of Paintings. Rev. and expanded ed. London: National Gallery, 2009.

MLA (8th ed.) Citation

Bomford, David, et al. A Closer Look: Conservation of Paintings. Rev. and expanded ed. National Gallery, 2009.