Gigliotti, J., & Copeland, G. (2019). Who was Stephen Hawking? Penguin Workshop, an imprint of Penguin Random House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGigliotti, Jim, और Gregory Copeland. Who Was Stephen Hawking? New York, New York: Penguin Workshop, an imprint of Penguin Random House, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGigliotti, Jim, और Gregory Copeland. Who Was Stephen Hawking? Penguin Workshop, an imprint of Penguin Random House, 2019.
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