Philippi, S. (1999). Christo and Jeanne-Claude: The Umbrellas, Japan - USA, 1984-91, A documentation exhibition ; Wrapped Reichstag, Berlin 1971-95 A documentation exhibition ; The Wall, Gasometer, Oberhausen 1999, 13,000 Oil Barrels / Photos : Wolfgang Volz. Taschen.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Philippi, Simone. Christo and Jeanne-Claude: The Umbrellas, Japan - USA, 1984-91, A Documentation Exhibition ; Wrapped Reichstag, Berlin 1971-95 A Documentation Exhibition ; The Wall, Gasometer, Oberhausen 1999, 13,000 Oil Barrels / Photos : Wolfgang Volz. Köln [u.a.]: Taschen, 1999.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Philippi, Simone. Christo and Jeanne-Claude: The Umbrellas, Japan - USA, 1984-91, A Documentation Exhibition ; Wrapped Reichstag, Berlin 1971-95 A Documentation Exhibition ; The Wall, Gasometer, Oberhausen 1999, 13,000 Oil Barrels / Photos : Wolfgang Volz. Taschen, 1999.