Alice Kuzniar, The Temporality of Landscape: Romantic Allegory and C. D. Friedrich, in Studies in Romanticism, vol. 28, n. 1, 1989, pp. 69–93, DOI:10.2307/25600760, ISSN 0039-3762 (WC · ACNP), JSTOR25600760.
jstor.org
Hermann Beenken, Caspar David Friedrich, in The Burlington Magazine for Connoisseurs, vol. 72, n. 421, aprile 1938, pp. 171–175, JSTOR867281.
Helmut Börsch-Supan, Caspar David Friedrich's Landscapes with Self-Portraits, in The Burlington Magazine, vol. 114, n. 834, settembre 1972, pp. 620–630, JSTOR877126.
Alice Kuzniar, The Temporality of Landscape: Romantic Allegory and C. D. Friedrich, in Studies in Romanticism, vol. 28, n. 1, 1989, pp. 69–93, DOI:10.2307/25600760, ISSN 0039-3762 (WC · ACNP), JSTOR25600760.
William Vaughan, Reviewed work(s): Caspar David Friedrich in seiner Zeit: Zeichnungen des Romantik und des Biedermeier by Hans Dickel; The Romantic Vision of Caspar David Friedrich + Painting and Drawings from the USSR by Sabine Rewald; Caspar David Friedrich and the Subject of Landscape by Joseph Leo Koerner, in The Burlington Magazine, vol. 133, n. 1062, settembre 1991, pp. 626–628, JSTOR884854.
Alice Kuzniar, The Temporality of Landscape: Romantic Allegory and C. D. Friedrich, in Studies in Romanticism, vol. 28, n. 1, 1989, pp. 69–93, DOI:10.2307/25600760, ISSN 0039-3762 (WC · ACNP), JSTOR25600760.
web.archive.org
Caspar-David-Friedrich-Institut, su cdfi.de, 30 aprile 2012. URL consultato il 13 gennaio 2014 (archiviato dall'url originale il 24 aprile 2014).
The Awestruck Witness, su time.com, Time Magazine, 28 ottobre 1974. URL consultato il 19 novembre 2008 (archiviato dall'url originale il 30 dicembre 2007).
Alice Kuzniar, The Temporality of Landscape: Romantic Allegory and C. D. Friedrich, in Studies in Romanticism, vol. 28, n. 1, 1989, pp. 69–93, DOI:10.2307/25600760, ISSN 0039-3762 (WC · ACNP), JSTOR25600760.
Suzanne Latt Epstein, The Relationship of the American Luminists to Caspar David Friedrich, New York, Columbia University, 1964, OCLC23758262.