Cita APA (7th ed.)
Koerner, J. L. (2009). Caspar David Friedrich and the subject of landscape (2nd ed.). Reaktion.
Cita Chicago (17th ed.)
Koerner, Joseph Leo. Caspar David Friedrich and the Subject of Landscape. 2nd ed. London: Reaktion, 2009.
Cita MLA (9th ed.)
Koerner, Joseph Leo. Caspar David Friedrich and the Subject of Landscape. 2nd ed. Reaktion, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.