Lewis Michael. (2017). Undoing Project: Friendship that Changed the World. Penguin Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLewis Michael. Undoing Project: Friendship That Changed the World. Penguin Books, 2017.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLewis Michael. Undoing Project: Friendship That Changed the World. Penguin Books, 2017.
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