Christian, D. (2018). Origin story: A big history of everything.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChristian, David. Origin Story: A Big History of Everything. 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रChristian, David. Origin Story: A Big History of Everything. 2018.
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