Levine, S., & Levine, S. (2005). Fernand Khnopff (1858-1921): Organized by the Musées Royaux des Beaux-Arts de Belgique, Brussels, under the patronage of Their Majesties the King and Queen of the Belgians, 16 january-9 may 2004 [...] : The fully illustrated Fernand Khnopff (1858-1921) catalogue [...] essays by Frederik Leen, [...]. Nineteenth century art worldwide.

Levine, Sura, und Sura Levine. "Fernand Khnopff (1858-1921): Organized By the Musées Royaux Des Beaux-Arts De Belgique, Brussels, Under the Patronage of Their Majesties the King and Queen of the Belgians, 16 January-9 May 2004 [...] : The Fully Illustrated Fernand Khnopff (1858-1921) Catalogue [...] Essays By Frederik Leen, [...]." Nineteenth Century Art Worldwide 2005.

Levine, Sura, und Sura Levine. "Fernand Khnopff (1858-1921): Organized By the Musées Royaux Des Beaux-Arts De Belgique, Brussels, Under the Patronage of Their Majesties the King and Queen of the Belgians, 16 January-9 May 2004 [...] : The Fully Illustrated Fernand Khnopff (1858-1921) Catalogue [...] Essays By Frederik Leen, [...]." Nineteenth Century Art Worldwide 2005.