Friedl, O. (2004). The Zhou Brothers, 30 Years of Collaboration: [ed. by Oskar Friedl]. Hatje Cantz Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFriedl, Oskar. The Zhou Brothers, 30 Years of Collaboration: [ed. by Oskar Friedl]. Ostfildern-Ruit: Hatje Cantz Verlag, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFriedl, Oskar. The Zhou Brothers, 30 Years of Collaboration: [ed. by Oskar Friedl]. Hatje Cantz Verlag, 2004.
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