Butts, B. (1991). Five centuries of drawing: Masterpieces from the Museum of Fine Arts, Leipzig; The Saint Louis Art Museum, February 2 - March 24, 1991 / Barbara Butts.
Chicago-referens (17:e uppl.)Butts, Barbara. Five Centuries of Drawing: Masterpieces from the Museum of Fine Arts, Leipzig; The Saint Louis Art Museum, February 2 - March 24, 1991 / Barbara Butts. Saint Louis, 1991.
MLA-referens (8:e uppl.)Butts, Barbara. Five Centuries of Drawing: Masterpieces from the Museum of Fine Arts, Leipzig; The Saint Louis Art Museum, February 2 - March 24, 1991 / Barbara Butts. 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.