Hergé, Lonsdale-Cooper, L., & Turner, M. R. (2014). The seven crystal balls (First edition.). Little, Brown and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHergé, Leslie Lonsdale-Cooper, और Michael R. Turner. The Seven Crystal Balls. First edition. New York: Little, Brown and Company, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHergé, et al. The Seven Crystal Balls. First edition. Little, Brown and Company, 2014.
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