Vaughan, W., Börsch-Supan, H., & Neidhardt, H. J. (1972). Caspar David Friedrich 1774-1840: Romantic landscape painting in Dresden.
Čikaški stil citiranja (17. izdanje)Vaughan, William, Helmut Börsch-Supan, i Hans Joachim Neidhardt. Caspar David Friedrich 1774-1840: Romantic Landscape Painting in Dresden. London, 1972.
MLA način citiranja (8. izdanje)Vaughan, William, et al. Caspar David Friedrich 1774-1840: Romantic Landscape Painting in Dresden. 1972.
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