Ermen, R. (1991). Hans Hofmann: Whitney Museum of American Art, New York, 20.6.-16.9.1990 : Center for the Fine Arts, Miami, November 1990 - Januar 1991 : The Chrysler Museum, Norfolk (Virginia), Februar - April 1991 / Reinhard Ermen. Kunstforum.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিErmen, Reinhard. "Hans Hofmann: Whitney Museum of American Art, New York, 20.6.-16.9.1990 : Center for the Fine Arts, Miami, November 1990 - Januar 1991 : The Chrysler Museum, Norfolk (Virginia), Februar - April 1991 / Reinhard Ermen." Kunstforum 1991.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিErmen, Reinhard. "Hans Hofmann: Whitney Museum of American Art, New York, 20.6.-16.9.1990 : Center for the Fine Arts, Miami, November 1990 - Januar 1991 : The Chrysler Museum, Norfolk (Virginia), Februar - April 1991 / Reinhard Ermen." Kunstforum, 1991.