Webster van Tonder, C., Retzlaff, E., & Brückle, W. (2014). Erich Retzlaff: Volksfotograf / Christopher Webster van Tonder ; with contributions by Rolf Sachsse and Wolfgang Brückle. School of Art Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWebster van Tonder, Christoph, Erich Retzlaff, और Wolfgang Brückle. Erich Retzlaff: Volksfotograf / Christopher Webster Van Tonder ; with Contributions by Rolf Sachsse and Wolfgang Brückle. Aberystwyth: School of Art Press, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWebster van Tonder, Christoph, et al. Erich Retzlaff: Volksfotograf / Christopher Webster Van Tonder ; with Contributions by Rolf Sachsse and Wolfgang Brückle. School of Art Press, 2014.
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