APA (7th ed.) Citation

Vaughan, W., & Friedrich, C. D. (2004). Friedrich. Phaidon.

Chicago Style (17th ed.) Citation

Vaughan, William, and Caspar David Friedrich. Friedrich. London ; New York: Phaidon, 2004.

MLA (9th ed.) Citation

Vaughan, William, and Caspar David Friedrich. Friedrich. Phaidon, 2004.