Loock, U., Wiitasalo, S., & Daniëls, R. (1993). René Daniëls, Shirley Wiitasalo: [Art Gallery of York University, Toronto, Ontario, January 13 - Februar 14, 1993, Illingworth Kerr Gallery Alberta College of Art, Calgary, Alberta, March 4 - March 25, 1993, Mackenzie Art Gallery, Regina, Saskatchewan, April 15 - Mai 31, 1993, Museum Haus Lange Krefeld, Germany, 1994] / Ulrich Loock. [Museum Haus Lange].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLoock, Ulrich, Shirley Wiitasalo, और René Daniëls. René Daniëls, Shirley Wiitasalo: [Art Gallery of York University, Toronto, Ontario, January 13 - Februar 14, 1993, Illingworth Kerr Gallery Alberta College of Art, Calgary, Alberta, March 4 - March 25, 1993, Mackenzie Art Gallery, Regina, Saskatchewan, April 15 - Mai 31, 1993, Museum Haus Lange Krefeld, Germany, 1994] / Ulrich Loock. [Krefeld] ; Toronto: [Museum Haus Lange], 1993.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLoock, Ulrich, et al. René Daniëls, Shirley Wiitasalo: [Art Gallery of York University, Toronto, Ontario, January 13 - Februar 14, 1993, Illingworth Kerr Gallery Alberta College of Art, Calgary, Alberta, March 4 - March 25, 1993, Mackenzie Art Gallery, Regina, Saskatchewan, April 15 - Mai 31, 1993, Museum Haus Lange Krefeld, Germany, 1994] / Ulrich Loock. [Museum Haus Lange], 1993.