APA (7th ed.) Citation

Hackney, F., & Hackney, I. (1990). The art of the world's greatest watercolourists. Quantum Books.

Chicago Style (17th ed.) Citation

Hackney, Fiona, and Isla Hackney. The Art of the World's Greatest Watercolourists. London: Quantum Books, 1990.

MLA (9th ed.) Citation

Hackney, Fiona, and Isla Hackney. The Art of the World's Greatest Watercolourists. Quantum Books, 1990.