APA (7th ed.) Citation

Twombly, C., Schmidt, K., & Frei, G. (2007). Cy Twombly. Thomas Ammann Fine Art.

Chicago Style (17th ed.) Citation

Twombly, Cy, Katharina Schmidt, and Georg Frei. Cy Twombly. Zurich: Thomas Ammann Fine Art, 2007.

MLA (9th ed.) Citation

Twombly, Cy, et al. Cy Twombly. Thomas Ammann Fine Art, 2007.