APA (7th ed.) Citation

Börsch-Supan, H., & Friedrich, C. D. (1990). Caspar David Friedrich (2. ed.). Prestel.

Chicago Style (17th ed.) Citation

Börsch-Supan, Helmut, and Caspar David Friedrich. Caspar David Friedrich. 2. ed. München: Prestel, 1990.

MLA (9th ed.) Citation

Börsch-Supan, Helmut, and Caspar David Friedrich. Caspar David Friedrich. 2. ed. Prestel, 1990.

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