Richards, J. (2013). Doctor Who 50: The essential guide. BBC Children's Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichards, Justin. Doctor Who 50: The Essential Guide. London: BBC Children's Books, 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRichards, Justin. Doctor Who 50: The Essential Guide. BBC Children's Books, 2013.
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