Retter, H. (1999). Postmodernity - What about Toys?: Symposium "postmodernity", 2. International Toy Research Conference, Halmstad University, Sweden, June 14-19 1999.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRetter, Hein. Postmodernity - What About Toys?: Symposium "Postmodernity", 2. International Toy Research Conference, Halmstad University, Sweden, June 14-19 1999. Braunschweig?, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRetter, Hein. Postmodernity - What About Toys?: Symposium "Postmodernity", 2. International Toy Research Conference, Halmstad University, Sweden, June 14-19 1999. 1999.
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