APA (7th ed.) Citation

Gibson, R., & Roberts, K. (1971). British portrait painters. Phaidon.

Chicago Style (17th ed.) Citation

Gibson, Robin, and Keith Roberts. British Portrait Painters. London: Phaidon, 1971.

MLA (9th ed.) Citation

Gibson, Robin, and Keith Roberts. British Portrait Painters. Phaidon, 1971.

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