APA (7th ed.) Citation

Ettlinger, L. D., & Friedrich, C. D. (1967). Caspar David Friedrich. Knowledge Publications.

Chicago Style (17th ed.) Citation

Ettlinger, Leopold David, and Caspar David Friedrich. Caspar David Friedrich. London: Knowledge Publications, 1967.

MLA (9th ed.) Citation

Ettlinger, Leopold David, and Caspar David Friedrich. Caspar David Friedrich. Knowledge Publications, 1967.

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