“Franz Marc Museum." Franz Marc Museum, 2002:
         http://www.franz-marc-museum.de/html/english.html.

“Guggenheim Collection - Artist - Marc - Biography." Guggenheim Museum, 2002:
         http://www.guggenheimcollection.org/site/artist_bio_98.html.

Levine, Frederick S. The Apocalyptic Vision: The Art of Franz Marc as
         German Expressionism. New York: Harper and Row, Publishers, 1979.

Macy. Laura (ed). Grove Art, 2002:
          http://www.groveart.com.

Myers, Bernard S. The German Expressionists. New York: Frederick A.
         Praeger, Publishers, 1966.

Pioch, Nicolas. “Marc, Franz." The WebMuseum, Paris, July 31, 2002:
         http://www.oir.ucf.edu/wm/paint/auth/marc/.

Rosenthal, Mark. Franz Marc. New York: Neves Publishing Company, 1989.

Wanczura, Dieter. “Franz Marc Biography 1880-1916." artelino - Art
         Auctions and Gallery, 2000:
         http://www.artelino.com/articles/franz_marc.asp.